William Moody on sat 21 jul 01
Try Laguna Borate. It seems to work well. Where I work/assist we use =
about 100 gms bentonite per 5000 gm batch of glaze.=20
----- Original Message -----=20
From: james w. thomas=20
To: CLAYART@LSV.CERAMICS.ORG=20
Sent: Saturday, July 21, 2001 1:16 AM
Subject: clear crackle
I'm a newby to the list and would like to say hello and ask a question =
of vast interest to me.
I've been firing Raku for about 6 years while attending college. A =
close friend of mine and I are planning on opening a small functional =
and aesthetic pottery and glass studio.=20
With Gertsley Borate being mined away what will be a worthwhile clear =
glaze for Raku firing?
I've tried 80/20 3220 frit to custer and even added bentonite the =
glaze would not gloss controllably. and colorants burned out and looked =
bad is there any hope?
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_________________________________________________________________________=
_____ 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.=20
james w. thomas on sat 21 jul 01
I'm a newby to the list and would like to say hello and ask a question of vast interest to me.
I've been firing Raku for about 6 years while attending college. A close friend of mine and I are planning on opening a small functional and aesthetic pottery and glass studio.
With Gertsley Borate being mined away what will be a worthwhile clear glaze for Raku firing?
I've tried 80/20 3220 frit to custer and even added bentonite the glaze would not gloss controllably. and colorants burned out and looked bad is there any hope?
Get your FREE download of MSN Explorer at http://explorer.msn.com
MaryBeth Bishop on sat 21 jul 01
Kickwheel Pottery supply has a frit they call Murray's Borate. I haven't
heard much about it on list and have a sample which I haven't tested. That
aside...a lot to push aside...they have some pictures on their web site of it
used in glazes that look good. You might want to go to Kickwheel.com and see
what's there. They are really quite helpful. You might want to include
this option in your tests.
Good luck,
Mary Beth Bishop
Ababi on sun 22 jul 01
After too many tests, I bought some k'g of Gerstley borate which is
still available here. For you who lives I belive in the USA, buy one
pound of each substitution to Gerstley borate and test it 80/20 with
Nephalin Seynite according to the way the supplier offers.
You might end there your traveling.
Ababi Sharon
Kibbutz Shoval- Israel
officially Glaze addict
ababisha@shoval.ardom.co.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/
---------- Original Message ----------
>
>Attachment converted:
> "D:\LINGO\Attach\LNG29703.HTM"
Ababi on sun 22 jul 01
After too many tests, I bought some k'g of Gerstley borate which is
still available here. For you who lives I belive in the USA, buy one
pound of each substitution to Gerstley borate and test it 80/20 with
Nephalin Seynite according to the way the supplier offers.
You might end there your traveling.
Ababi Sharon
Kibbutz Shoval- Israel
officially Glaze addict
ababisha@shoval.ardom.co.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
I'm a newby to the list and would like to say hello and ask a question
of vast interest to me.
I've been firing Raku for about 6 years while attending college. A
close friend of mine and I are planning on opening a small functional
and aesthetic pottery and glass studio.
With Gertsley Borate being mined away what will be a worthwhile clear
glaze for Raku firing?
I've tried 80/20 3220 frit to custer and even added bentonite the glaze
would not gloss controllably. and colorants burned out and looked bad
is there any hope?
------------------------------------------------------------------------
--------
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________________________________________________________________________
______ 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.
Tom Buck on sun 22 jul 01
MBB, et al:
There are available at least four substitutes for Gerstley Borate
and they include:
Murray's Borate, a frit containing Calcium boro-silicate and
Sodium boro-silicate and small amounts of magnesium (as silicate) and
alumina (Mary Simmons reported the anlysis on Clayart last year); MB
mixes tend to settle in a few hours.
Boraq, a material mix that emulates GB, it contains ulexite and
colemanite as did GB. Prepared by Plainsman Clays, it provides a
suspension activity similar to GB.
Gillespie borate, from Hammill & Gillespie, is a material mix that
like Boraq uses ulexite and colemanite, and behaves much like GB in its
good years.
Laguna borate, also a material mix that relies on Cadycal (a
chemically-produced Calcium borate). Glaze mixes with it tend to settle in
a few hours.
There have been reports of a material from Mexico (a frit?) and
ulexite and colemanite from South America.
I have done some testing: Murray's borate gave a workable white
crackle (fine lines); Boraq1 yielded a satiny C06 transclucent; Gillespie
B produced a good result when used in my Raku red lustre (No. 8). Friend
Dale Mark makes C9/10 procelain in copper red, mottled blue, and Celadon.
He tells me that he was unable to get satisfactory results from Laguna
borate but that Boraq gave him the mottled blue he needs.
It would help if other Clayarters would post results of their
tests with these GB subs.
til later. Peace. Tom B.
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 Sat, 21 Jul 2001, MaryBeth Bishop wrote:
> Kickwheel Pottery supply has a frit they call Murray's Borate. I haven't
> heard much about it on list and have a sample which I haven't tested. That
> aside...a lot to push aside...they have some pictures on their web site of it
> used in glazes that look good. You might want to go to Kickwheel.com and see
> what's there. They are really quite helpful. You might want to include
> this option in your tests.
> Good luck,
> Mary Beth Bishop
>
> ______________________________________________________________________________
> 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.
>
james w. thomas on sun 22 jul 01
Thanks Tom for the information> I started out using 80 Colemanite/ 20 Custer. Now Colemanite is apparently gone.When I started working for Bruce O'dell here in Ruston LA he used exclusively 80 GB/ 20 Custer. We have since switched to Laguna Borate since they are supposed to be refining the last of the material from the Gerts mines but this will be gone soon. I've never used Neph Sey. instead of Custer. It looks like I have a lot of test tiles to work on. Thank you again for the enlightening information and I hope you will not mind if I contact you off of the list at some later date.
>From: Tom Buck
>Reply-To: Ceramic Arts Discussion List
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Re: clear crackle
>Date: Sun, 22 Jul 2001 00:36:36 -0400
>
>MBB, et al:
> There are available at least four substitutes for Gerstley Borate
>and they include:
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