Carole Fox on fri 19 dec 03
I often have trouble with the RR black ^6 glaze crawling in spots. So
annoying! - just one little spot on each piece! I wash my bisque ware under
running water and I don't have this problem with my other glazes. I end up
refiring almost 50% of my black glazed pots! Any suggestions?
Carole Fox
Silver Fox Pottery
Elkton, MD
thesilverfox@dol.net
John Hesselberth on fri 19 dec 03
On Friday, December 19, 2003, at 09:00 AM, Carole Fox wrote:
> I wash my bisque ware under
> running water and I don't have this problem with my other glazes. I
> end up
> refiring almost 50% of my black glazed pots! Any suggestions?
Hi Carole,
Are you letting the bisque thoroughly dry after washing? Unless you
have unusually dusty bisque there is little need to wash it to avoid
crawling. I personally use a barely damp sponge (or nothing depending
on how much of a hurry I am in) and I've never seen that glaze crawl. I
suspect something is going wrong with your washing--try it without and
see what happens.
Regards,
John
http://www.frogpondpottery.com
http://www.masteringglazes.com
Chris Schafale on sat 20 dec 03
I stopped using that glaze altogether because of this very problem.
Chris
On 19 Dec 2003 at 19:50, John Hesselberth wrote:
I've never seen that glaze crawl. I
> suspect something is going wrong with your washing--try it without and
> see what happens.
>
> Regards,
>
> John
--
Light One Candle Pottery
Fuquay-Varina, North Carolina, USA
(south of Raleigh, NC)
www.lightonecandle.com
NEW email: chris at lightonecandle dot com
(insert the @ and . as appropriate)
Randy McCall on sat 20 dec 03
I had the same problem also with it crawling.
> I stopped using that glaze altogether because of this very problem.
>
> Chris
>
> On 19 Dec 2003 at 19:50, John Hesselberth wrote:
>
> I've never seen that glaze crawl. I
> > suspect something is going wrong with your washing--try it without and
> > see what happens.
Ron Roy on sun 21 dec 03
For those of you who are having this problem - please email me and I will
send a revised version with ball clay rather than all EPK. I have had this
problem before with EPK - sometimes - I think it solvable.
Just email me and tell me what ball clay you would like to use.
RR
>I often have trouble with the RR black ^6 glaze crawling in spots. So
>annoying! - just one little spot on each piece! I wash my bisque ware under
>running water and I don't have this problem with my other glazes. I end up
>refiring almost 50% of my black glazed pots! Any suggestions?
>Carole Fox
>Silver Fox Pottery
>Elkton, MD
>thesilverfox@dol.net
>
>______________________________________________________________________________
>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.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Nick Molatore on sun 21 dec 03
I also had touble with the black. Had to get just the right thickness or it
would crack when it dried and then crawl. The fix was to calcine about half
the
EPK. I can now use as thick or thin and double coat or use it over or under
other glazes without any problem. Calcining kaolin (I just put it a bowl
and bisque fire)
drives off the H2O and it weighs less. The recipe calls for 17 EPK. I
replace this with 10 EPK and 5.9 of
calcined EPK.
-Nick
----- Original Message -----
From: "Carole Fox"
Sent: Friday, December 19, 2003 6:00 AM
Subject: RR black crawling
> I often have trouble with the RR black ^6 glaze crawling in spots. So
> annoying! - just one little spot on each piece! I wash my bisque ware
under
> running water and I don't have this problem with my other glazes. I end up
> refiring almost 50% of my black glazed pots! Any suggestions?
> Carole Fox
> Silver Fox Pottery
> Elkton, MD
> thesilverfox@dol.net
>
Carole Fox on mon 22 dec 03
Nick and all-
It looks like a lot of us have had this problem with RR black and calcining
really looks like a viable solution. Wahoo- I will get to calcine some EPK!
I have been reading about calcining on clayart for years but never had the
need to do it. I will definitely do this for the next batch I mix.
Unfortunately, I still have two thirds of a large bucket full of the crawly
stuff. I guess I'll wait until it gets halfway down and then mix in half a
batch of the new stuff.
For those of you who thought it was my bisque washing- I NEED to wash this
bisque under running water. It comes out of the bisque fir coated with a
layer of powdery clay dust. I rinse them off while still warm from the kiln
and dry on metal racks until they no longer feel cool or wet. I can't
imagine having to wipe down each piece with a sponge -it would take so long!
Some suggested application may be at fault and I'll have to be careful to
check for drips on the dry glaze. I know I am not applying the glaze too
thickly over all because it really only crawls in one small spot on each
piece. I do appreciate all the posts on this and apologize for not
responding offline to individuals. It's that crazy time of year- baking a
zillion cookies and selling pots to lots of last minute shoppers (who act
like I'm doing THEM a big favor by letting them into my studio to shop!)
And hey, so maybe I've never seen the Northern lights and the thought of
freezing my patooty off to catch a glimpse is not so appealing... I DID see
a bald eagle the other day as I was unloading pot boxes from the car. It was
HUGE and so close I didn't even need binoculars!
Happy Solstice,
Carole
Carole Fox
Silver Fox Pottery
Elkton, MD
thesilverfox@dol.net
----- Original Message -----
From: "Nick Molatore"
To:
Sent: Sunday, December 21, 2003 9:24 PM
Subject: Re: RR black crawling
> I also had touble with the black. Had to get just the right thickness or
it
> would crack when it dried and then crawl. The fix was to calcine about
half
> the
> EPK. I can now use as thick or thin and double coat or use it over or
under
> other glazes without any problem. Calcining kaolin (I just put it a bowl
> and bisque fire)
> drives off the H2O and it weighs less. The recipe calls for 17 EPK. I
> replace this with 10 EPK and 5.9 of
> calcined EPK.
>
> -Nick
Randy McCall on mon 22 dec 03
Roy I use OM-4 ball clay Kentucky.
----- Original Message -----
From: "Ron Roy"
To:
Sent: Sunday, December 21, 2003 11:45 PM
Subject: Re: RR black crawling
> For those of you who are having this problem - please email me and I will
> send a revised version with ball clay rather than all EPK. I have had this
> problem before with EPK - sometimes - I think it solvable.
>
> Just email me and tell me what ball clay you would like to use.
>
> RR
>
>
>
> >I often have trouble with the RR black ^6 glaze crawling in spots. So
> >annoying! - just one little spot on each piece! I wash my bisque ware
under
> >running water and I don't have this problem with my other glazes. I end
up
> >refiring almost 50% of my black glazed pots! Any suggestions?
> >Carole Fox
> >Silver Fox Pottery
> >Elkton, MD
> >thesilverfox@dol.net
> >
>
>___________________________________________________________________________
___
> >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.
>
> Ron Roy
> RR#4
> 15084 Little Lake Road
> Brighton, Ontario
> Canada
> K0K 1H0
> Phone: 613-475-9544
> Fax: 613-475-3513
>
>
____________________________________________________________________________
__
> 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.
>
william schran on mon 22 dec 03
Carole wrote: >For those of you who thought it was my bisque washing-
I NEED to wash this
bisque under running water. It comes out of the bisque fir coated with a
layer of powdery clay dust.<
Do you sand your dry greenware prior to bisque firing? I'm trying to
figure out the "bisque fir" thing. I can always tell which of my
students have sanded their greenware because the dust is there before
& after the firing. If it wasn't sanded, there ain't no "fir".
Bill
Earl Krueger on tue 23 dec 03
> Carole wrote:
> I NEED to wash this bisque under running water.
> It comes out of the bisque fir coated with a
> layer of powdery clay dust.<
Carole,
Do your pots have the "fir" after drying but before bisque firing?
If so, could be that there is something in solution in the water in the
clay that is crystalizing out during the drying process. This might
also be what is causing your glaze to crawl.
Earl...
Bothell, WA, USA
Catherine White on tue 23 dec 03
Is it possible that Carole's "fir" was a typo? That she meant bisque fire?
Not that that changes the powdery clay dust layer. :- )
Catherine in Yuma, AZ
Worry is interest paid on a debt you haven't incurred.
----- Original Message -----
> > Carole wrote:
> > I NEED to wash this bisque under running water.
> > It comes out of the bisque fir coated with a
> > layer of powdery clay dust.<
Earl Krueger on sun 28 dec 03
Carole Fox wrote:
> The pots come out of the bisque fire
> coated with a clay dust.
> I wish I knew why this was so.
Carole,
OK, I understand but my original question still
holds. Is there dust on the pots after drying but
before bisque firing?
I had another thought. It is possible that as the
kiln heats something evaporates from the walls
or elements and condenses on the cooler pots
creating a dust. Similar to when copper or chrome
evaporates from one pot and creates a blush on
an adjacent pot. When you look at the inside of
your kiln can you see any differences in color or
texture, especially around the elements or near
the lid?
Can you remember if you changed anything, like
your clay or glaze just before this started happening?
What glazes other than the RR black do you use?
Anybody out there seen anything like this happen?
Earl...
Bothell, WA, USA
Cindi Anderson on mon 29 dec 03
I often have dust on my bisque that I have to wash off. It is not on the
greenware before firing the bisque. Some clays are worse than others. This
is so common for me that I was surprised to hear that some other people
never have to wash their bisque. I just took a class at another studio and
that bisque never had dust on it. I don't know if it was the clay or the
fact that they fired in gas kilns instead of electric or...?
Cindi
Fremont, CA
> OK, I understand but my original question still
> holds. Is there dust on the pots after drying but
> before bisque firing?
Mert & Holly Kilpatrick on mon 29 dec 03
Just to weigh in on the "to wash or not to wash" before
glazing question. After unloading the bisque, when it is
totally cool, I cover the bisque with a plastic sheet, so
the general studio dust doesn't sift onto it before I get it
glazed. If a piece has not been covered or has been sitting
around for ages, I may dust it off with a clean paintbrush.
Or if I Dremel something I will use the paintbrush, or maybe
a slightly damp sponge. I have never had crawling due to
dust.
Maybe it is something to do with the climate? Or as you
say, the claybodies. We use Standard, HMI or Tucker
claybodies, and fire Cone 6 oxidation.
Holly
East Bangor, PA
----- Original Message -----
From: "Cindi Anderson"
> I often have dust on my bisque that I have to wash off.
It is not on the
> greenware before firing the bisque. Some clays are worse
than others. This
> is so common for me that I was surprised to hear that some
other people
> never have to wash their bisque. I just took a class at
another studio and
> that bisque never had dust on it. I don't know if it was
the clay or the
> fact that they fired in gas kilns instead of electric
or...?
>
> Cindi
> Fremont, CA
>
> > OK, I understand but my original question still
> > holds. Is there dust on the pots after drying but
> > before bisque firing?
>
>
____________________________________________________________
__________________
> 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.
| |
|
