clennell on mon 16 aug 99
>----------------------------Original message----------------------------
>They have renamed this to Ravenscrag Slip and I made a cool
>'raven' logo for it. They are now shipping samples.
>This is a very unique material, 100% gives you a silky white
>at cone 10. Add 20% frit 3134 for a glossy clear at cone 6.
>There is a 50 mile long 3 foot thick layer of this stuff at
>the quarry site.
Dear Tony: Tell us more. This could be the slip I've been looking for. I
posted on Clayart several months ago a post looking for a slip I can use
very thick for pouring and dipping. Is this it?
I know this will have the Captains spincter tightening but I do love the
idea of these highly complex materials that allow the use of one or two
materials to make a slip/glaze.
I look forward to potters experiments with this material. I've sent for my
samples. Wish I could fire it in my next Baco firing.
KISS! Keep it simple, stupid! That's my motto. Waiting for the Captain
to jump all over me. I haven't seen him for a month or so. So I need
disciplinin'!
Make my sample a big one. I always try things by the ton.
Cheers,
Tony
Born in Medicine Hat, Alberta and still trying to cover my cowboy redneck.
Tony and Sheila Clennell
Sour Cherry Pottery
4545 King St.
Beamsville, On. L0R 1B1
Tony Hansen on tue 17 aug 99
> Tell us more. This could be the slip I've been looking for. I
> posted on Clayart several months ago a post looking for a slip I can use
> very thick for pouring and dipping. Is this it?
Yes. This is it. I have done four thick layers on bisque and dry. No
hint of cracking or crawling. Once you've used something that applies as
well as this stuff you'll never know how you did without it. All by itself this
is a silky white at cone 10R.
--
T o n y H a n s e n thansen@digitalfire.com
Don't fight the dragon alone http://digitalfire.com
Calculation/Database Software for Ceramic Industry
--
Christine Laginess on wed 18 aug 99
Please resend the recipe for this slip. Sounds like something I could use
and I have erased the information.
Christine
chris1clay@aol.com
Tony Hansen on fri 20 aug 99
I have been looking more closely at ware we got out of another test
firing
and there was a pleasant surprise. We tried putting a layer of Rslip
under
neath various troublesome glazes and found:
-a variegated gloss blue that normally needs to be very thick gave the
same results when applied thinnly over Rslip.
-a very matte powder blue give a much better surface (it is normally
too matte with pinholes but over rslip it is perfect).
-a chrome green is much brighter and even though it sits on a vertical
surface, the horizontal edge does not flow downward at all, it is
perfectly straight even though the Rclip under it is fluid?
-We expected to have glazes running down around the foot ring on the
vases
having an underlayer of RSlip but all the glazes were totally stable.
-This time ware with 100% Rslip was glossier than last firing, very
impressive.
We are going to do a load of crocks next week all completely glazed with
an Rslip:Feldspar mix. If anyone has any news about their tests please
let me or the group know.
--
T o n y H a n s e n thansen@digitalfire.com
For a Ravencrags sample visit:
http://ceramicsearch.com/plainsman/data/raven.htm
Mo and Les Beardsley on sun 22 aug 99
clennell wrote:
>
> ----------------------------Original message----------------------------
> >----------------------------Original message----------------------------
> >They have renamed this to Ravenscrag Slip and I made a cool
> >'raven' logo for it. They are now shipping samples.
> >This is a very unique material, 100% gives you a silky white
> >at cone 10. Add 20% frit 3134 for a glossy clear at cone 6.
> >There is a 50 mile long 3 foot thick layer of this stuff at
> >the quarry site.
>
> Dear Tony: Tell us more. This could be the slip I've been looking for. I
> posted on Clayart several months ago a post looking for a slip I can use
> very thick for pouring and dipping. Is this it?
> I know this will have the Captains spincter tightening but I do love the
> idea of these highly complex materials that allow the use of one or two
> materials to make a slip/glaze.
> I look forward to potters experiments with this material. I've sent for my
> samples. Wish I could fire it in my next Baco firing.
> KISS! Keep it simple, stupid! That's my motto. Waiting for the Captain
> to jump all over me. I haven't seen him for a month or so. So I need
> disciplinin'!
> Make my sample a big one. I always try things by the ton.
> Cheers,
> Tony
> Born in Medicine Hat, Alberta and still trying to cover my cowboy redneck.
>
> Tony and Sheila Clennell
> Sour Cherry Pottery
> 4545 King St.
> Beamsville, On. L0R 1B1
Toni
Could you send the address for samples of Ravenscrag slip as at the
Tozan firing we were talking about it and the group would like to send
in a group order for the samples.
Thanks...Maureen Beardsley
Noborigama went down at 5:30 am Saturday. Won't know results for a
few days but the firing went well. A lot was learned and we had a
wonderful time with a simply great group of people...We crowned and king
and got a great shepard to lead the flock...all in good fun of course.
Tasha Olive on wed 25 aug 99
Dear fellow clayeaters;
Am new to the clayart forum so hope you wont be to rough on me if I'm not
doing something right here! I have only a healthy fear of kilns ( and toxic
ingredients) but cannot shake an insane fear of comptuers. Anyway, here
goes: after a couple weeks of "just reading" all the interesting comments
I've decided I must simply know more about several referring to a slip named
Ravenscrag. Who out there can tell me more please, and where can I purchase
the sample I've read of? Also, can anyone tell me of a fluid,opalescent
(milky) type glaze in the cone 6-8 range? Any info will be much
appreciated. Used to have a recipe for a glaze called Maia, but alas have
lost. Thanks
Tasha
-----Original Message-----
From: Mo and Les Beardsley
To: CLAYART@LSV.UKY.EDU
Date: Sunday, August 22, 1999 6:17 PM
Subject: Re: Ravenscrag Slip
>----------------------------Original message----------------------------
>clennell wrote:
>>
>> ----------------------------Original message----------------------------
>> >----------------------------Original message----------------------------
>> >They have renamed this to Ravenscrag Slip and I made a cool
>> >'raven' logo for it. They are now shipping samples.
>> >This is a very unique material, 100% gives you a silky white
>> >at cone 10. Add 20% frit 3134 for a glossy clear at cone 6.
>> >There is a 50 mile long 3 foot thick layer of this stuff at
>> >the quarry site.
>>
>> Dear Tony: Tell us more. This could be the slip I've been looking for. I
>> posted on Clayart several months ago a post looking for a slip I can use
>> very thick for pouring and dipping. Is this it?
>> I know this will have the Captains spincter tightening but I do love the
>> idea of these highly complex materials that allow the use of one or two
>> materials to make a slip/glaze.
>> I look forward to potters experiments with this material. I've sent for
my
>> samples. Wish I could fire it in my next Baco firing.
>> KISS! Keep it simple, stupid! That's my motto. Waiting for the Captain
>> to jump all over me. I haven't seen him for a month or so. So I need
>> disciplinin'!
>> Make my sample a big one. I always try things by the ton.
>> Cheers,
>> Tony
>> Born in Medicine Hat, Alberta and still trying to cover my cowboy
redneck.
>>
>> Tony and Sheila Clennell
>> Sour Cherry Pottery
>> 4545 King St.
>> Beamsville, On. L0R 1B1
>Toni
>
>Could you send the address for samples of Ravenscrag slip as at the
>Tozan firing we were talking about it and the group would like to send
>in a group order for the samples.
>
>Thanks...Maureen Beardsley
>
>Noborigama went down at 5:30 am Saturday. Won't know results for a
>few days but the firing went well. A lot was learned and we had a
>wonderful time with a simply great group of people...We crowned and king
>and got a great shepard to lead the flock...all in good fun of course.
Carolynn Palmer on mon 4 oct 99
Did anybody else send for this slip? Is anybody doing anything with it?
Carolynn Palmer
Somerset Center, Michigan
Don Prey on tue 5 oct 99
In a message dated 10/04/99 3:41:28 PM, you wrote:
<<----------------------------Original message----------------------------
Did anybody else send for this slip? Is anybody doing anything with it?
Carolynn Palmer
Somerset Center, Michigan
>>
Hi Carolynn,
I bought 10 pounds through the Archie Bray Foundation. I was going to wait
until I had more to say before reporting....but since you ask: My one fired
result so far came out of Craig Martell's salt kiln yesterday (sunday). It
is a small covered box, slab built out of Rod's Bod clay (Laguna). At the
leather hard stage, I dipped both the top and bottom in what I judged to be a
thin mixture of straight slip, covering only the outside. After slow drying
some of the thicker areas started to separate from the underlying clay. I
just removed what slip really wanted to come off and feathered the edges.
There was a bit more separation in the bisque and I used the same edge
smoothing technique. So I have some more to learn about the variables
associated with application.
The piece may end up being my favorite from the salt firing. The areas of
clay body not covered by slip are a rich orange peel brown. The slip is a
glossy, lightly crazed, verigated iron green glaze. Salting for this cone 10
firing was moderate. (I attended Craig's Salt Firing Workshop......a dozen
of us had a great time and learned alot). I have a test sample of B-mix
(white stoneware) dipped in the same batch in a cone 10R firing that is
happening now so will know a bit more in a few days. And you????
Don Prey in Oregon
Kathy McDonald on tue 5 oct 99
Carolyn,
I did send for the slip and received my sample last week.
(Thanks Plainsman!!)
I am presently doing some pieces and intend to test it at cone 10 reduction
my next firing, I will post results here and hopefully can send people some
digital images of pots fired with this slip.
I really like the way it applies, very smooth and silky, no need to screen
it at all. If it fires like it applies ,,,it's a winner!!!
PS I may even get to sneak a couple of pieces in the wood kiln firing at
"1000 Miles Apart" ........wonder what it does in wood???
Kathy McDonald
http://members.tripod.com/~kmcd3
"Never doubt that a small group of individuals working together can change
the world ; indeed it is the on thing that ever does"
Margaret Mead
-----Original Message-----
From: Carolynn Palmer
To: CLAYART@LSV.UKY.EDU
Date: October 4, 1999 5:39 PM
Subject: Ravenscrag Slip
>----------------------------Original message----------------------------
>Did anybody else send for this slip? Is anybody doing anything with it?
>
>Carolynn Palmer
>Somerset Center, Michigan
Bill Campbell on tue 5 oct 99
Carolynne I have been testing ravenscrag slip for several months. I have been
using it to make an Albany like slip. I have also been trying it with
different fluxes to get varied textures and color responses. I have and
continue to test with calcium, magnesium ,sodium ,strontium, phosporus,and
lithium.I have had very good luck with all of these fluxes. The tests with
boron haven`t been verey good. These tests have been at cone ten in a mild
reduction.
the material is rather like using albany slip without the inconvenience of
having iron in it. The particle size allows it to be applied to the pot
without the problems that are often accompanying albany glazes. It doesn`t
crack no matter how thick it is applied.
makes nice glazes without a lot of other ingedients.
Good testing.
Bill
Wade Blocker on tue 5 oct 99
Carolynn,
I have purchased 5 lbs of Ravenscrag slip. I am waiting for my
pots to dry so that I can try it out. It will be several weeks before I
have any results. Being an optimist I hope for the best. I will try it out
as recommended., and will post my results. Mia in sunny ABQ where the
balloon festival is in full swing. So far only half a dozen mishaps to
ballonists.
Tony Hansen on wed 6 oct 99
> Did anybody else send for this slip? Is anybody doing anything with it?
We've been getting some good feedback and continue to improve the
webpage describing it at
http://ceramicsearch.com/plainsman/data/raven.htm
For example: It doesn't work as a terra sig.
It works very well as a base for otherwise troublesome glazes.
I have an MSDS done now and you can download it in Acrobat format
from the web page, this is required by many instituions.
We are still getting tons of requests and it looks
like everyone will be in a testing mode for at least the next few months.
I am going to be testing it at low fire in the coming month.
--
T o n y H a n s e n thansen@digitalfire.com
Don't fight the dragon alone http://digitalfire.com
Calculation/Database Software for Ceramic Industry
--
clennell on wed 6 oct 99
My tests so far with Ravenscrag have been ho-hum. I just received my 50 lb
bag today so I will test full tilt boogie.
As far as being able to put it on very thick- I tried it on bisque and it
cracked and peeled all to rat shit.
I will try tomorrow on green ware.
In the wood kiln by itself it was a bad green on our clay which has ochre
in it to toast it up. It did however flux to a decent glaze but without the
character I'm interested in.
We put it in the gas kiln on a standard clay body and it was a good white
liner glaze by itself at cone 11. Once again not very interesting but
fluxed and clean.
I did a line blend of ash and ravenscrag- no keepers.
It did look good as a slip under my ash glaze-this is the avenue I intend
to follow in the next week. Perhaps a thin cloat and then a heavy
ladle.??????????
I'll keep you posted, if you do the same.
Cheers,
Tony
Tony and Sheila Clennell
Sour Cherry Pottery
4545 King St.
Beamsville, On. L0R 1B1
Jeff Campana on thu 7 oct 99
Sorry, but could someone please tell me where I could get some of this
ever-elusive Ravenscrag Slip? I've never even heard of it before, but it
might make a nice ash glaze. Any information (adress, phone, website) would
be much appreciated.
Jeff Campana
Jackie Richards on wed 13 oct 99
Where do you get this Ravenscrag Slip?
Mike Gordon on fri 16 feb 01
Hi,
Try using the same formula on bisque ware and see if that makes a
difference. I've used Ravenscrag on bisque and had no problems. Mike
Gordon
Snail Scott on fri 16 feb 01
I just finished testing glazes made from
Ravenscrag Slip. (Never used it before.)
I did as the manufacturer's literature
suggested, mixing in 10% and 20% of
frit 3134 to bring it down to ^6. I also
added various oxides and stains in
typically used amounts. The brochure
indicated a very low likelihood of
crazing or crawling, even with 'straight'
slip. However, I got the worst crawling
that I can recall!
The crawling was worst on the samples
with higher levels of frit (20%). Of
those, the worst results were the ones
with stains (10%) rather than oxides.
The clay was Laguna's ^5 Buff Sculpture.
All the samples were applied to green
clay (dry or almost) by brushing in
successive layers (1,2,and 3). The
crawling was worst at 2 coats and above.
The tests were fired to a 'tip-down'
visual ^6 in oxidation.
I contacted the manufacturer, but have
not received any suggestions.
I would have thought that nonplastic
additives like frits and stains would
reduce the likelihood of crawling, not
increase it! Am I confused?
Help would be gratefully received, as I'd
rather not do more tests without a better
idea of what happened the first time.
-Snail
Tony Hansen on sun 18 feb 01
>I did as the manufacturer's literature suggested, mixing in 10% and 20% of
>frit 3134 to bring it down to ^6. I also added various oxides and stains in
>typically used amounts. The brochure indicated a very low likelihood of
>crazing or crawling, even with 'straight' slip. However, I got the worst
crawling
>that I can recall!
I have been developing RSlip for Plainsman and we do get some people having
this sort of problem. We are still in the testing stages with this material
and I
am trying to make sense of it. However the material definitely works well for
double and triple layer glazing in our circumstances and it does indeed melt
to a white glaze at cone 10 all by itself. Because we are handling
the evaluation phase through a web site we have gotten a lot of feedback in
the past few months. Some people have completed testing and development
and are ordering larger amounts. Others are having problems. We are going to
be evaluating the whole situation in the next few months and emailing everyone.
I think part of the reason is that we are used to getting glaze recipes,
plugging
things in, and expecting them to work. With this material we are not giving
recipes,
but rather encouraging people to blend it with other materials and
experiment to
create something new.
> I contacted the manufacturer, but have not received any suggestions.
We have been trying to respond but keep getting the message bounching back.
====================================================
T o n y H a n s e n thansen@digitalfire.com
clennell on sun 18 feb 01
Sour Cherry Pottery
I'm out to lunch in the Cone 6 dept but at Cone l0 I found that by adding
10% whiting to the Ravenscrag we got a nice buttery hard white glaze. Very
suitable for a liner type glaze. On it's own it was a matt eggshell surface
that didn't really appeal to me.
cheers,
Tony
Wes Rolley on fri 29 nov 02
--=======5967F17=======
Content-Type: text/plain; x-avg-checked=avg-ok-24F82233; charset=iso-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
Is there any supplier in the United States for Ravenscrag Slip other than=20
Axner's? I have nothing against Axner's. I just don't like the idea of=20
paying shipping from Florida to California?
wes
"I find I have a great lot to learn =96 or unlearn. I seem to know far too=
=20
much and this knowledge obscures the really significant facts, but I am=20
getting on." -- Charles Rennie Mackintosh
Wesley C. Rolley
17211 Quail Court
Morgan Hill, CA 95037
wrolley@charter.net
(408)778-3024
--=======5967F17=======--
Mike Gordon on fri 29 nov 02
Wes,
I can't find my original paper work on it but I'm pretty sure I got mine
from The Archie Bray Foundation, in Montana. I'll look for it when I get
down to the studio later this A.M.. Mike Gordon, Walnut Creek, Ca.
Ned Ludd on fri 29 nov 02
>Wes Rolley wrote
>Is there any supplier in the United States for Ravenscrag Slip other than=20
>Axner's? I have nothing against Axner's. I just don't like the idea of=20
>paying shipping from Florida to California?
>
>wes
Hi Wes,
Try Archie Bray up in Helena, Mont.
Clay business #s are:
800-443-6434
406-442-2521
406-442-6437 (FAX)
and email: claybiz@archiebray.org
I like Ravenscrag a lot. It has a little too much MgO for my present
purposes. Still, I'll keep a sack on hand.
ciao
Ned, in Butte County, N Cal.
Joyce Lee on fri 29 nov 02
I received my ravenscrag slip from The Archie Bray in Helena (?), =
Montana. I've
had a fair supply on hand for quite a
lengthy time.... would appreciate any
information as to how others are using
it. I seem to need more detail than to just "use it as you would any =
other slip." I'm only now beginning to work with slips and
know too little for that advice to apply. Thank you.
Joyce
In the Mojave where the ravens have
been putting up with the westie's
antics ... being chased and assailed
with loud yips&yaps ..... I used to
chase them off the place with a
broom ... they're so bright that they
learned to fly the property line on=20
the way to the dump and not stray
over to our side. They give me such
pleasure, though, that I've gotten
lax ... may have to get up the gumption
to give them another go ..... a go away,
that is. Don't want them peckin' the
westie.
Matt MacIntire on sat 30 nov 02
Wes,
It is my understanding that Ravenscrag comes from Plainsman Clays Ltd.
in Canada. Any of their regular dealers ought to be able to get you
some. There is a full list of Plainsman dealers on their website:
http://digitalfire.com/plainsman/dealers.php
I see they have dealers in Montanna and Oregon. That should be better
for you than Florida.
Ravenscrag is a great material. I've been working on several glazes
that use it as a base.
Matt
Tony Hansen on tue 24 jun 03
We got the URL www.ravenscrag.com, we are hoping
to put some shots of history of the town in there.
Few people realize how isolated these small prairie
towns are.
You can find the blue glaze at the website.
We are currently working on tons of new recipes,
we are finding great success at low, medium and
high fire.
-------8<--------
Hello Tony--
I just got my BC Potters newsletter and read your article on
Ravenscrag Slip. I\'ve always been interested in this material because
of the name. Nearly 25 years ago my husband was invited to Ravenscrag
to tell the people how they could create their own community history
book. Our toddler and I went with him. It was a wonderful experience,
the people were so welcoming to us westcoasters, especially the
little one of course. I don\'t know if they ever did the book, the
place was pretty much a ghost town even then.
I looked at the Ravenscrag slip site and I\'m not sure which glaze
you\'re referring to as a worthy successor to floating blue. I am
having such spotty results with floating blue I\'d be glad to buy some
Ravenscrag and try something else.
Mary
--
Mary White
HARBOUR PUBLISHING
Box 219
Madeira Park, BC
V0N 2H0
------------------
Publishers of the Encyclopedia of British Columbia.
Visit the Encyclopedia website at http://www.knowbc.com.
--------
Tony Hansen, Digitalfire Corp.
The Hallquist's on mon 6 oct 03
I was wondering if anyone can tell me where to find the glaze recipes =
for Ravenscrag Slip. I saw them on a website a couple months ago but =
can't remember which one. I tried going to the Plainsman website but =
can't find them. I thought I saw recipes and pictures of glazes as =
well, maybe I'm dreaming???
Thanks
Nancy
Mert & Holly Kilpatrick on tue 7 oct 03
http://www.ravenscrag.com/
----- Original Message -----
From: "The Hallquist's"
To:
Sent: Tuesday, October 07, 2003 12:13 AM
Subject: Ravenscrag Slip
I was wondering if anyone can tell me where to find the glaze recipes for
Ravenscrag Slip. I saw them on a website a couple months ago but can't
remember which one. I tried going to the Plainsman website but can't find
them. I thought I saw recipes and pictures of glazes as well, maybe I'm
dreaming???
Thanks
Nancy
Tony Hansen on tue 7 oct 03
www.ravenscrag.com
-------8<--------
I was wondering if anyone can tell me where to find the glaze recipes =
for Ravenscrag Slip. I saw them on a website a couple months ago but =
can\'t remember which one. I tried going to the Plainsman website but =
can\'t find them. I thought I saw recipes and pictures of glazes as =
well, maybe I\'m dreaming???
Thanks
Nancy
______________________________________________________________________________
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
--------
Tony Hansen, Digitalfire Corp.
Joyce Lee on tue 7 oct 03
I purchased my last 50 lbs of ravenscrag slip
from
The Archie Bray Foundation for the Ceramic
Arts, located in Helena, Montana. They
are dealers for Plainsman Clay as I recall.
They're easy to find on the net....... search for
Archie Bray ...... easy to order. Just call.
While I'm mentioning them, they are a great
place to visit ...... to poke around....... for
some reason when
I've been there (3X) only once were there
more than half a dozen other visitors. I know
that they have classes and workshops going
most of the time ...... just happened that we
were there on off days ...... an "on" day for
us. Very inspiring. Lots of history. Wonderful
ambiance. Vibes were creative..... respectful....
calming..... caring..... made one want to
tiptoe about and simply look and look and look
until stricken by imagination overload ....... I
wouldn't have been too surprised to find my own
face in the old photos scattered about....=20
Joyce
In the Mojave
The Hallquist's on wed 8 oct 03
Thank you to everyone who answered my request for the website. I got it.
It was the one I was looking for. And Tony, I looked at your site. It is
great. I love that blue green glaze and the Waterfall brown over the cream
is lovely too.
Nancy
----- Original Message -----
From: "TedFab Faber"
To:
Sent: Wednesday, October 08, 2003 6:05 PM
Subject: Re: Ravenscrag Slip
The Hallquist's
I copied this information from my files . I hope helps.
Ravenscrag Slip was developed at Plainsman Clays, as an almost-complete
base cone 10 glaze material with superior application and multi-layering
properties. In educational and beginning pottery settings it is an ideal
starting point for material-blending style glaze development and
experimentation with colors, opacifiers, and variegators.
By itself Ravenscrag Slip fires as a clear semi-glossy glaze at cone 10.
With additions of flux you can adapt it to any temperature. The principal
ingredient in Ravenscrag Slip is mined from Plainsman Clays own huge
deposits near Ravenscrag, Saskatchewan in Canada. The material contains
enough clay to give it some plasticity and dry hardness; and there is a
variety of other very fine mineral particles that do not interact with water
the way clay particles do. These particles give it its melting and
application properties.
So how do you use Ravenscrag Slip? The three essential components of a glaze
are glass (silica), clay for suspension, and flux for melting (Ravenscrag
Slip has all of them). At cone 10 you can use Ravenscrag as is, or for a
more interesting surface add a flux material (e.g. whiting, frit 3134,
dolomite, spodumene, zinc, or nepheline syenite). At cone 6 extra flux is
needed (adjust the amount of flux to fine tune the melt). Ravenscrag
supplies all the needed clay and silica for a typical recipe. As well,
Ravenscrag is a great base for making calcium, magnesia and alumina mattes.
Thus Ravenscrag Slip is a "base" that you can "tweak" with fluxes,
opacifiers, variegating and matting agents. Currently glaze recipes are
being developed and added to this web site on an ongoing basis. You are also
invited to submit your Ravenscrag Slip recipes and share ideas.
http://www.archive.org/
Ravenscrag Slip
They have renamed this to Ravenscrag Slip and I made a cool 'raven' logo for
it. They are now shipping samples. This is a very unique material, 100%
gives you a silky white at cone 10. Add 20% frit 3134 for a glossy clear at
cone 6. There is a 50 mile long 3 foot thick layer of this stuff at the
quarry site.
The huge advantage of this material is this: It has great application
properties and you can lay it down in multiple layers on bisque or greenware
without crawling or cracking. This opens a whole new world of possible
decorative effects.
For detailed info visit its webpage at
http://www.ceramicsearch.com/plainsman/data/raven.htm You can request a
sample from this page and it will be available through the Archie Bray
Foundation in the US. I will be updating this page constantly. Please email
me at plainsman@digitalfire.com after you have tested it and let me know
what worked and what did not so I can post for others. I want to create a
reference for students to foster the create-and-understand-your-own-glaze
movement.
If you need to duplicate Albany slip with this material try starting with
4-6% iron and about 15-25% frit 3134. Adjust for color with the iron and
increase or decrease the frit to adjust melt fluidity.
Tests
putting a layer of Rslip under neath various troublesome glazes and found:
-a variegated gloss blue that normally needs to be very thick gave the same
results when applied thinnly over Rslip. -a very matte powder blue give a
much better surface (it is normally too matte with pinholes but over rslip
it is perfect). -a chrome green is much brighter and even though it sits on
a vertical surface, the horizontal edge does not flow downward at all, it is
perfectly straight even though the Rclip under it is fluid? -We expected to
have glazes running down around the foot ring on the vases having an
underlayer of RSlip but all the glazes were totally stable. -This time ware
with 100% Rslip was glossier than last firing, very impressive.
the manufacturer's literature suggested, mixing in 10% and 20% of frit 3134
to bring it down to ^6. I also added various oxides and stains in typically
used amounts. The brochure indicated a very low likelihood of crazing or
crawling, even with 'straight' slip. However, I got the worst crawling that
I can recall!
The crawling was worst on the samples with higher levels of frit (20%). Of
those, the worst results were the ones with stains (10%) rather than oxides.
Reaction to materials
Carolynne I have been testing ravenscrag slip for several months. I have
been using it to make an Albany like slip. I have also been trying it with
different fluxes to get varied textures and color responses. I have and
continue to test with calcium, magnesium ,sodium ,strontium, phosporus,and
lithium.I have had very good luck with all of these fluxes. The tests with
boron haven`t been verey good. These tests have been at cone ten in a mild
reduction. the material is rather like using albany slip without the
inconvenience of having iron in it. The particle size allows it to be
applied to the pot without the problems that are often accompanying albany
glazes. It doesn`t crack no matter how thick it is applied. makes nice
glazes without a lot of other ingedients. Good testing. Bill
The clay was Laguna's ^5 Buff Sculpture. All the samples were applied to
green clay (dry or almost) by brushing in successive layers (1,2,and 3). The
crawling was worst at 2 coats and above.
The tests were fired to a 'tip-down' visual ^6 in oxidation.
I contacted the manufacturer, but have not received any suggestions.
-Stable & reliable, a hundred-year supply -A silty low iron clay, it applies
evenly, drains dripfree, dries hard, doesn't settle -Add frit/feldspar for
lower fire, silica for gloss -Use as base, add colorants, opacifiers,
variegators -Use as an underlayer for vibrancy in fluid glazes without
associated running -Use multilayers on green/bisque without crawling or
cracking; opens a whole new area of decorative effects with colored and
fluid/non-fluid multi-layers -.
10 % Whitting
I'm out to lunch in the Cone 6 dept but at Cone l0 I found that by adding
10% whiting to the Ravenscrag we got a nice buttery hard white glaze. Very
suitable for a liner type glaze. On it's own it was a matt eggshell surface
that didn't really appeal to me. cheers, Tony
To purchase Ravenscrag Slip contact Plainsman Clays or any of its dealers.
To find out the dealer near you visit Plainsman Clays website or call,
1-403-527-8535 or fax 1-403-527-7508.
www.plainsmanclays.com
Kat Valenzuela
----- Original Message -----
From: The Hallquist's
To: CLAYART@LSV.CERAMICS.ORG
Sent: Tuesday, October 07, 2003 12:13 AM
Subject: Ravenscrag Slip
I was wondering if anyone can tell me where to find the glaze recipes for
Ravenscrag Slip. I saw them on a website a couple months ago but can't
remember which one. I tried going to the Plainsman website but can't find
them. I thought I saw recipes and pictures of glazes as well, maybe I'm
dreaming???
Thanks
Nancy
____________________________________________________________________________
__
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You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
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melpots@pclink.com.
____________________________________________________________________________
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
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TedFab Faber on wed 8 oct 03
The Hallquist's
I copied this information from my files . I hope helps.=20
Ravenscrag Slip was developed at Plainsman Clays, as an almost-complete =
base cone 10 glaze material with superior application and multi-layering =
properties. In educational and beginning pottery settings it is an =
ideal starting point for material-blending style glaze development and =
experimentation with colors, opacifiers, and variegators.=20
By itself Ravenscrag Slip fires as a clear semi-glossy glaze at cone 10. =
With additions of flux you can adapt it to any temperature. The =
principal ingredient in Ravenscrag Slip is mined from Plainsman Clays =
own huge deposits near Ravenscrag, Saskatchewan in Canada. The material =
contains enough clay to give it some plasticity and dry hardness; and =
there is a variety of other very fine mineral particles that do not =
interact with water the way clay particles do. These particles give it =
its melting and application properties.
So how do you use Ravenscrag Slip? The three essential components of a =
glaze are glass (silica), clay for suspension, and flux for melting =
(Ravenscrag Slip has all of them). At cone 10 you can use Ravenscrag as =
is, or for a more interesting surface add a flux material (e.g. =
whiting, frit 3134, dolomite, spodumene, zinc, or nepheline syenite). =
At cone 6 extra flux is needed (adjust the amount of flux to fine tune =
the melt). Ravenscrag supplies all the needed clay and silica for a =
typical recipe. As well, Ravenscrag is a great base for making calcium, =
magnesia and alumina mattes.=20
Thus Ravenscrag Slip is a "base" that you can "tweak" with fluxes, =
opacifiers, variegating and matting agents. Currently glaze recipes are =
being developed and added to this web site on an ongoing basis. You are =
also invited to submit your Ravenscrag Slip recipes and share ideas.=20
=20
http://www.archive.org/
=20
Ravenscrag Slip
They have renamed this to Ravenscrag Slip and I made a cool 'raven' logo =
for it. They are now shipping samples. This is a very unique material, =
100% gives you a silky white at cone 10. Add 20% frit 3134 for a glossy =
clear at cone 6. There is a 50 mile long 3 foot thick layer of this =
stuff at the quarry site.=20
The huge advantage of this material is this: It has great application =
properties and you can lay it down in multiple layers on bisque or =
greenware without crawling or cracking. This opens a whole new world of =
possible decorative effects.=20
For detailed info visit its webpage at =
http://www.ceramicsearch.com/plainsman/data/raven.htm You can request a =
sample from this page and it will be available through the Archie Bray =
Foundation in the US. I will be updating this page constantly. Please =
email me at plainsman@digitalfire.com after you have tested it and let =
me know what worked and what did not so I can post for others. I want to =
create a reference for students to foster the =
create-and-understand-your-own-glaze movement.=20
If you need to duplicate Albany slip with this material try starting =
with 4-6% iron and about 15-25% frit 3134. Adjust for color with the =
iron and increase or decrease the frit to adjust melt fluidity.=20
=20
Tests
putting a layer of Rslip under neath various troublesome glazes and =
found:=20
-a variegated gloss blue that normally needs to be very thick gave the =
same results when applied thinnly over Rslip. -a very matte powder blue =
give a much better surface (it is normally too matte with pinholes but =
over rslip it is perfect). -a chrome green is much brighter and even =
though it sits on a vertical surface, the horizontal edge does not flow =
downward at all, it is perfectly straight even though the Rclip under it =
is fluid? -We expected to have glazes running down around the foot ring =
on the vases having an underlayer of RSlip but all the glazes were =
totally stable. -This time ware with 100% Rslip was glossier than last =
firing, very impressive.=20
the manufacturer's literature suggested, mixing in 10% and 20% of frit =
3134 to bring it down to ^6. I also added various oxides and stains in =
typically used amounts. The brochure indicated a very low likelihood of =
crazing or crawling, even with 'straight' slip. However, I got the worst =
crawling that I can recall!=20
The crawling was worst on the samples with higher levels of frit (20%). =
Of those, the worst results were the ones with stains (10%) rather than =
oxides.=20
=20
=20
Reaction to materials
Carolynne I have been testing ravenscrag slip for several months. I have =
been using it to make an Albany like slip. I have also been trying it =
with different fluxes to get varied textures and color responses. I have =
and continue to test with calcium, magnesium ,sodium ,strontium, =
phosporus,and lithium.I have had very good luck with all of these =
fluxes. The tests with boron haven`t been verey good. These tests have =
been at cone ten in a mild reduction. the material is rather like using =
albany slip without the inconvenience of having iron in it. The particle =
size allows it to be applied to the pot without the problems that are =
often accompanying albany glazes. It doesn`t crack no matter how thick =
it is applied. makes nice glazes without a lot of other ingedients. Good =
testing. Bill=20
The clay was Laguna's ^5 Buff Sculpture. All the samples were applied to =
green clay (dry or almost) by brushing in successive layers (1,2,and 3). =
The crawling was worst at 2 coats and above.=20
The tests were fired to a 'tip-down' visual ^6 in oxidation.=20
I contacted the manufacturer, but have not received any suggestions.=20
-Stable & reliable, a hundred-year supply -A silty low iron clay, it =
applies evenly, drains dripfree, dries hard, doesn't settle -Add =
frit/feldspar for lower fire, silica for gloss -Use as base, add =
colorants, opacifiers, variegators -Use as an underlayer for vibrancy in =
fluid glazes without associated running -Use multilayers on green/bisque =
without crawling or cracking; opens a whole new area of decorative =
effects with colored and fluid/non-fluid multi-layers -.=20
=20
10 % Whitting
I'm out to lunch in the Cone 6 dept but at Cone l0 I found that by =
adding 10% whiting to the Ravenscrag we got a nice buttery hard white =
glaze. Very suitable for a liner type glaze. On it's own it was a matt =
eggshell surface that didn't really appeal to me. cheers, Tony=20
=20
To purchase Ravenscrag Slip contact Plainsman Clays or any of its =
dealers. To find out the dealer near you visit Plainsman Clays website =
or call, 1-403-527-8535 or fax 1-403-527-7508.
www.plainsmanclays.com =20
Kat Valenzuela
----- Original Message -----=20
From: The Hallquist's=20
To: CLAYART@LSV.CERAMICS.ORG=20
Sent: Tuesday, October 07, 2003 12:13 AM
Subject: Ravenscrag Slip
I was wondering if anyone can tell me where to find the glaze recipes =
for Ravenscrag Slip. I saw them on a website a couple months ago but =
can't remember which one. I tried going to the Plainsman website but =
can't find them. I thought I saw recipes and pictures of glazes as =
well, maybe I'm dreaming???
Thanks
Nancy
=
_________________________________________________________________________=
_____
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at =
melpots@pclink.com.
Ababi on thu 9 oct 03
I made a substitution for the Ravenscrag Slip, because it might be too
expensive for me to buy it.
Ravenscrag Slip sub
====================
BALL CLAY (AK)...... 28.3 28.30%
CUSTER FELDSPAR..... 28.3 28.30%
WOLLASTONITE........ 9.4 9.43%
TALC- NYTAL......... 4.2 4.16%
TITANIUM DIOXIDE.... 0.4 0.37%
QUARTZ.............. 28.8 28.81%
R.I.O............... 0.6 0.62%
========
100.0
CaO 0.491* 5.241%
MgO 0.263* 2.019%
K2O 0.173* 3.098%
Na2O 0.074* 0.868%
TiO2 0.027 0.409%
Al2O3 0.763 14.827%
SiO2 6.340 72.551%
Fe2O3 0.032 0.988%
Si:Al 8.305
SiB:Al 8.305
Expan 5.845
With an add of 17-20% Soft borax frit from BPS it suppose to be good at
^6
Just see how many materials you need to replace it. It looks to me as a
good deal. The variety of flux can defiantly help to create nice colors,
I would buy it!
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910
http://www.matrix2000.co.nz/Matrix%20Demo/Ababi.htm
Snail Scott on thu 9 oct 03
At 09:05 PM 10/8/03 -0400, Kat V wrote:
>The crawling was worst on the samples with higher levels of frit (20%). Of
those, the worst results were the ones with stains (10%) rather than oxides.
This corresponds exactly with my tests. Horrible crawling
with 20% of frit 3134, especially the ones with stains.
Hadn't expected that, since frit and stain are non-plastic
materials. Any ideas why? (Surface tension of the melt,
maybe?)
-Snail
Charles Moore on fri 10 oct 03
Hello, Snail,
When you were in Sacramento on your way to Marin county to set up your
installation, I gave you a little faceted "tea bowl" that was made of 80%
Ravenscrag Slip and 20% Frit 3134 + 3% each of Cobalt Carb., Titanium, and
Rutile--one of Kat's recipes. I have not had any problem with crawling.
I did try a couple of tests with commercial stains and found the colors
pretty far off. Kat Valenzuela has printed some very workable glaze recipes
on www.ravenscrag.com. I notice, however, that she used oxides rather than
stains. I have tried (I think) four of her recipes with very good success.
I will, however, never again use "Kat's Matt." It was terribly dry. Might
be OK for non functional work.
I was pleased to see the praise on Calyart coming your way from your showing
at the Sacramento Art Center.
My best,
Charles
----- Original Message -----
From: "Snail Scott"
To:
Sent: Thursday, October 09, 2003 7:36 AM
Subject: Re: Ravenscrag Slip
> At 09:05 PM 10/8/03 -0400, Kat V wrote:
> >The crawling was worst on the samples with higher levels of frit (20%).
Of
> those, the worst results were the ones with stains (10%) rather than
oxides.
>
>
> This corresponds exactly with my tests. Horrible crawling
> with 20% of frit 3134, especially the ones with stains.
> Hadn't expected that, since frit and stain are non-plastic
> materials. Any ideas why? (Surface tension of the melt,
> maybe?)
>
> -Snail
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
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