John Britt on thu 7 aug 08
Kim,
I am having trouble logging on, but I try to post recipes any chance I ge=
t.
It is actually SDSU Crawl (San Diego State University Crawl)cone 05:
47 Gerstley Borate
31 Magnesium Carbonate
19 EPK
4 Borax
Now, I know that according the to the conventional clayart wisdom you
should not really be unable to fire this without the accompaning "BOOK" t=
o
describe the firing, cooling and dilatomoter readings as well as toxicity=
,
crazing and amounts of copper before your lemonade gets green.
Buuuuut thankfully for you, merely a kiln god and some cones will do.
The lower you fire it the more crusty it is (cone 07 or 06)and it is
called "Lichen" at that point. And as you go higher it will melt more and
become a "Crawl" glaze (05) and higher it will be a "Bead" glaze.
Be careful and because without the $39.00 book you never know if it will
explode!
Glaze on Humans,
John Britt
www.johnbrittpottery.com/wks.htm
Kim Hohlmayer on thu 7 aug 08
Hi John,
When you were still at Rosewood in Kettering, Ohio, you shared a low fire, gerstley borate glaze with me that beaded and crawled. Since moving (do I even need to say it at this point) it is one of the items gone missing. Would you be so kind as to share it again? Thank you. --Kim H.
Brian on sat 9 aug 08
On 8/08/2008, at 12:27 PM, John Britt wrote:
> The lower you fire it the more crusty it is (cone 07 or 06)and it is
> called "Lichen" at that point. And as you go higher it will melt
> more and
> become a "Crawl" glaze (05) and higher it will be a "Bead" glaze.
As a method of learning and creating personal surfaces I have used
this idea of firing mixtures through a wide range of temperatures in
several "Creative Texture" workshops.
Using very simplified volume mixtures it has been possible to witness
hundreds of variations in material behaviour like creeping,
crawling, beading, blistering and oozing lava type. In every case
precision becomes a handicap when it comes to cones and temperature.
If function is not an issue for the work it seems that there is a wide
world of discovery in firing at different temperatures.
In addition to Magnesium Carbonate, tin Oxide, Titanium, zinc oxide,
bone ash, and kaolin can also texture, crawl creep and bead (in the
way that John describes) when use in larger amounts in some mixtures.
Brian
----------------------------
Brian Gartside
Pukekohe, New Zealand
http://www.gartside.info
http://www.briangartside.com
Kim Hohlmayer on tue 12 aug 08
Thank you, John. I am glad to have the recipe. I promise to mix and use it carefully. Thanks again. Oh, and sorry it took so long to get back to you. I haven't been to the library in about a week. I had around 250 emails waiting when I logged on this morning. --Kim H.
--- On Thu, 8/7/08, John Britt wrote:
> From: John Britt
> Subject: Re: John Britt's Crawly Glaze
> To: CLAYART@LSV.CERAMICS.ORG
> Date: Thursday, August 7, 2008, 8:27 PM
> Kim,
>
> I am having trouble logging on, but I try to post recipes
> any chance I get.
>
> It is actually SDSU Crawl (San Diego State University
> Crawl)cone 05:
>
> 47 Gerstley Borate
> 31 Magnesium Carbonate
> 19 EPK
> 4 Borax
>
> Now, I know that according the to the conventional clayart
> wisdom you
> should not really be unable to fire this without the
> accompaning "BOOK" to
> describe the firing, cooling and dilatomoter readings as
> well as toxicity,
> crazing and amounts of copper before your lemonade gets
> green.
>
> Buuuuut thankfully for you, merely a kiln god and some
> cones will do.
>
> The lower you fire it the more crusty it is (cone 07 or
> 06)and it is
> called "Lichen" at that point. And as you go
> higher it will melt more and
> become a "Crawl" glaze (05) and higher it will be
> a "Bead" glaze.
>
> Be careful and because without the $39.00 book you never
> know if it will
> explode!
>
> Glaze on Humans,
>
> John Britt
> www.johnbrittpottery.com/wks.htm
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