Penni Stoddart on sun 14 apr 02
Long story short..... I was given what was supposed to be " a couple of =
boxes of glaze stuff" turned out it was four boxes of "glaze stuff" =
including sieves and scoops and cones.
Just went through it all tonight to re-pack it more safely as I have a =
three year old who is way too curious for his own good. Listed it all as =
I went and discovered two bags that were not marked at all. Mystery =
ingredients =3Do)
Here is my list that jives with the original list:
Ball Clay (OM4)
Albany Slip (like gold I have discovered)
Dolomite
Bentonite
Talc
Barnard Clay
Black Copper Oxide
Cobalt Oxide
Rutile
Cobalt Carb.
Maganese Dioxide
Zinc Oxide
Gerstley Borate (also like gold - I know)
Neph Sy (other wise known as ????? - long name I mean)
EPK
Red Iron Oxide
Zircopax
Flint Silica
Whiting
Here are the 4 names I couldn't get to work out:
I have; F4 Feldspar
Feldspar Potash=20
a white powder - looks like talc- very fine (unmarked)
a gray ash like powder ( also unmarked)
Original list;
G200
Kona F-4
Plastic Vitrox
I just noticed that I have 23 ingredients listed (including unmarked =
bags) and the original list only has 22 ingredients. So one of the =
unmarked bags is a repeat. Any way of figuring it out for sure?
Also, I have a few glazes I would like to mix but am missing some of the =
ingredients. Can I substitute any of those listed above for;
custer feldspar (is this like just "feldspar"?)
silica
3134 frit
silica flint (same as silica ?)
strontium carb
I know I will get lots of help just because this list is like that. So =
in dvance of all the posts both public and to me privately, thanks a =
ton!
~~~~
Penni Stoddart of Penelope's Pots
Now acting as PAST President,
Artisans London (Ontario, Canada)
I live in my own little world, but it's ok... they know me here
Dupre Mr Marcy M on mon 15 apr 02
Penni,
You have indeed struck a gold mine! Depending on the amounts of materials
you've received, you should be able to make a whole bunch of glazes.
Albany Slip is wonderful stuff. Just mix with water and brush on either
greenware or bisque fired ware. A rich, warm brown, like a Boston Bean Pot.
The Barnard clay is good, also.
"Silica" and "flint" are the same. Use both in the same fashion.
If you can't identify the white powder, don't use it except in tests. That
MAY be the Plastic Vitrox, but get a recipe that uses plastic vitrox and
TEST.
The "long name" for "Neph Sy" is Nepheline Syenite. A wonderful description
of the chemical and its uses is in Mimi Obstler's "Out of the Earth Into the
Fire."
There are those who curse the "Ghastly Borate" and those who praise the
gerstley borate. Test, test, test! Always test first. Better to waste a
test tile than a pot in which you have invested several hours.
G200 and Kona F4 are both feldspars. "F4" and "Kona F4" are the same, as
far as I know. Feldspar potash is, of course one of the feldspars. Which
brand, I don't know. Test.
Gray powder could be wood ash or volcanic ash. Both are flux materials.
Test.
Gather some "reliable" recipes for glazes. Get Ron and John's book,
"Mastering Cone Six Glazes," and Mimi Obstler's, "Out of the Earth Into the
Fire." Both are excellent references, well-written, well-researched, easy
to understand.
Have loads of fun and let us know how things turn out.
Tig
Play Dirty!
Christena Schafale on mon 15 apr 02
Hi Penni,
If I understand you correctly, these are the ones that didn't "match
up". If that's right, then I can help with a couple, anyway. F4 feldspar
is the same thing as Kona F4. The Feldspar Potash is probably the G200
(which is a potash feldspar, roughly equivalent to Custer). I don't know
about the unmarked ones. For the glaze you want to mix, use the G200 as a
sub for the Custer. Silica=Silica flint=flint silica, which you have. The
frit and the strontium you are going to have to buy if you want to make
those glazes exactly. Happy testing!
Chris
>Here are the 4 names I couldn't get to work out:
>I have; F4 Feldspar
> Feldspar Potash
> a white powder - looks like talc- very fine (unmarked)
> a gray ash like powder ( also unmarked)
>Original list;
> G200
> Kona F-4
> Plastic Vitrox
>
>Also, I have a few glazes I would like to mix but am missing some of the
>ingredients. Can I substitute any of those listed above for;
>custer feldspar (is this like just "feldspar"?)
>silica
>3134 frit
>silica flint (same as silica ?)
>strontium carb
Marcia Selsor on mon 15 apr 02
Gray powder could be talc or bentonite also.
Have to test.
Marcia in Montana
sounds like a lot of good materials.
Dupre Mr Marcy M wrote:
>
> Penni,
>
> You have indeed struck a gold mine! Depending on the amounts of materials
> you've received, you should be able to make a whole bunch of glazes.
>
> SNIP
>
> Gray powder could be wood ash or volcanic ash. Both are flux materials.
> Test.
>
> Gather some "reliable" recipes for glazes. Get Ron and John's book,
> "Mastering Cone Six Glazes," and Mimi Obstler's, "Out of the Earth Into
the
> Fire." Both are excellent references, well-written, well-researched, easy
> to understand.
>
> Have loads of fun and let us know how things turn out.
>
> Tig
> Play Dirty!
>
>
____________________________________________________________________________
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--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/Tuscany2002.html
potterybydai on mon 15 apr 02
Penni - a while back there was a list of chemicals and their weights posted.
It should be in the archives. I think the deal is to take an exact measure
(volume) of the mystery stuff and weigh it, and by the weight you can figure
out what it is. Or did I just dream this?
Dai in Kelowna, BC
potterybydai@shaw.ca
Life is 10% what happens to you, and 90% how you
respond to it.
Snail Scott on mon 15 apr 02
At 11:34 PM 4/14/02 -0400, Penni wrote:
>Neph Sy (other wise known as ????? - long name I mean)
Nepheline Syenite - it's a sort of 'cousin' to
soda feldspar.
>F4 Feldspar
Also called Kona F-4. It's a soda feldspar.
>Feldspar Potash
There are many types of potash feldspar. For most
purposes, they are interchangeable, so it doesn't
really matter which one this is.
>a white powder - looks like talc- very fine (unmarked)
Throw it out. No white ceramic material is so
valuable that you want to risk being wrong.
>a gray ash like powder ( also unmarked)
Might be ash. Put a little on a flat test tile
and see how it melts.
>G200
This is a potash feldspar.
>Plastic Vitrox
Also called PV clay.
>I just noticed that I have 23 ingredients listed (including unmarked bags)
and the original list only has 22 ingredients. So one of the unmarked bags
is a repeat. Any way of figuring it out for sure?
Don't bother. The risk of being wrong is too great. Your work
and effort are worth more than a few bucks in raw materials.
>Can I substitute any of those listed above for;
>custer feldspar (is this like just "feldspar"?)
It's a potash feldspar. Just use the unidentified
kind you mentioned above.
>silica
No substitute for silica, you'd better get some! (also known
as flint and quartz.)
>3134 frit
You could use Gerstley Borate, but why? Save it for the glazes
that really need it. Go get the frit.
>silica flint (same as silica ?)
Yes
>strontium carb
You can substitute barium for some glazes. But you'll
probably want to order some strontium anyway. (The
conversion is 1 part barium to .75 of strontium.)
-Snail
Alisa og Claus Clausen on mon 15 apr 02
Dear Penni,
Lucky you. You got a good stash!
Flint is Silica and also called Quartz
Neph. Sy. is Nepheline Syenite
Kona F4 is F4 Feldspar
G200 is Feldspar Potash
Do not know how you can identify the Plastic Vitrox or ash like material.
>Also, I have a few glazes I would like to mix but am missing some of the
>ingredients. Can I substitute any of those listed above for;
>You can sub. Kona F4 custer feldspar
>silica is Flint
>Nothing here for 3134 frit
>silica flint (same as silica ?) Yes
>Strontium carb is a good sub for Barium, using molecular weight it would
>be 0.75 Stront. Carb. to 1.0 Barium Carb.
regards from Alisa in Denmark
Tom Buck on tue 16 apr 02
fyi:
see below, where applicable:
Tom Buck ) tel: 905-389-2339
(westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street,
Hamilton ON L8T 3E1 Canada
On Sun, 14 Apr 2002, Penni Stoddart wrote:
>
> Here is my list that jives with the original list:
> Ball Clay (OM4)
> Albany Slip (like gold I have discovered)
> Dolomite
> Bentonite
> Talc
> Barnard Clay
> Black Copper Oxide
> Cobalt Oxide
> Rutile
> Cobalt Carb.
> Maganese Dioxide
> Zinc Oxide
> Gerstley Borate (also like gold - I know)
> Neph Sy (other wise known as ????? - long name I mean)
this is nepheline syenite, a mineral mined and purifed in Ontario,
used primarily as a filler in various chemical and rubber products, as
well as in ceramics. it is a 1:1:4 crystalline material...1 mole Na2O:1
mole Al2O3:4 moles SiO2
> EPK....Edgar Plastic Kaolin
> Red Iron Oxide
> Zircopax
> Flint Silica
> Whiting
>
> Here are the 4 names I couldn't get to work out:
> I have; F4 Feldspar Kona F-4 Feldspar, a "soda" feldspar
> Feldspar Potash ..G-200 or Custer or ????
> a white powder - looks like talc- very fine (unmarked)
.....if it is slightly "soapy" it probably is talc; compared it with the
known Talc.
> a gray ash like powder ( also unmarked)
this may be bone ash, or crude calcium phosphate, sometimes used
in raku and midfire glazes.
> Original list;
> G200
a feldspar, potash feldspar.
> Kona F-4, a feldspar, soda feldspar.
> Plastic Vitrox, a mineral mined in California; it has high
flint, and yet is plastic.
>
> I just noticed that I have 23 ingredients listed (including unmarked bags)
and the original list only has 22 ingredients. So one of the unmarked bags
is a repeat. Any way of figuring it out for sure?
>
> Also, I have a few glazes I would like to mix but am missing some of the
ingredients. Can I substitute any of those listed above for;
> custer feldspar (is this like just "feldspar"?)
YES
> silica .....aka Flint or Quartz.
> 3134 frit, an "alkaline borate frit", contains Na2O, CaO, B2O3, SiO2.
> silica flint (same as silica ?), YES, Flint is used in NAm. Silica,
Europe mostly, and Quartz often used in Asia.
> strontium carb, strontium carbonate a sub for Barium Carbonate
75SrCO3=100BaCO3.
good pots. Peace. Tom B.
David Hewitt on tue 16 apr 02
I think you may have been thinking of a reference to my web site which
contains an article on 'Those Unlabelled Bags and Buckets'
Got to:-
http://www.dhpot.demon.co.uk
and Pottery Techniques / Unlabelled Bags & Buckets
David
In message , potterybydai writes
>Penni - a while back there was a list of chemicals and their weights post=
>ed.
>It should be in the archives. I think the deal is to take an exact measu=
>re
>(volume) of the mystery stuff and weigh it, and by the weight you can fig=
>ure
>out what it is. Or did I just dream this?
>Dai in Kelowna, BC
>potterybydai@shaw.ca
>
> Life is 10% what happens to you, and 90% how you
>respond to it.
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Web site http://www.dhpot.demon.co.uk
Russel Fouts on tue 16 apr 02
Snail,
>>>a white powder - looks like talc- very fine (unmarked) <<<
>Throw it out. No white ceramic material is so valuable that you want to
risk being wrong. <
How about Tin? Really expensive! I'm not saying that it is but I'd test
it anyway.
>>>a gray ash like powder ( also unmarked) <<<
> Might be ash. Put a little on a flat test tile and see how it melts. <
I'm not sure who it was, maybe Hank Murrow who had a whole system
testing using fusion buttons maid out of the various materials.
You wouldn't have to test them in glazes.
Russel
--
Russel Fouts
Mes Potes & Mes Pots
Brussels, Belgium
Tel: +32 2 223 02 75
Mobile: +32 476 55 38 75
Email: Russel.Fouts@Skynet.be
Http://www.mypots.com
http://www.Japan-Net.ne.jp/~iwcat
"There is a theory which states that
if ever anyone discovers exactly what
the universe is for and why it's here,
it will instantly disappear and be
replaced by something even more bizzarly
inexplicable."
"There is another theory which states
that this has already happened!"
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Snail Scott on tue 16 apr 02
At 08:35 AM 4/16/02 +0200, you wrote:
>Snail,
>How about Tin? Really expensive! I'm not saying that it is but I'd test
>it anyway.
>I'm not sure who it was, maybe Hank Murrow who had a whole system
>testing using fusion buttons maid out of the various materials.
Yeah, OK, I forgot about tin...
Susan Peterson's 'The Craft and Art of Clay'
has a nice photo page of fusion test buttons -
potentially very useful. Might as well test the
white stuff along with the grey. It could be
informative, and takes very little effort.
-Snail
LOGAN OPLINGER on wed 17 apr 02
The gray powder may also be spodumene, if it from a batch that was being
shipped a few years ago. This is a lithium bearing mineral.
Logan
--
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