Karen Sullivan on thu 7 sep 00
on 9/7/00 10:54 AM, Karen Sullivan at kwinnies@earthlink.net wrote:
> I love Yoshiro Ikeda's work....
> I may be guessing, but I think he fires around ^1-^4.
> I have used magnesium carbonate, perhaps 3% in a glaze to get the glaze to
> crawl. The magnesium carb. is the magic element.
> This started by using Tom Coleman's P.D. Shino Crack glaze. It's a ^10 glaze
> that I fire a bit hotter.
>
> custer feldspar 8.0
> spodumene 11.26
> soda ash 2.96
> epk kaolin 25.93
> Neph syneite 37.04
> OM4 ball clay 11.11
> Magnesium carbonate 3.70
>
> The application is somewhat important, the thicker the glaze the more it pulls
> into beads to the point that the glaze will pull away from the clay body in
> beads, leaving the raw clay surface. With a thinner application one gets a
> crackle/rough surface. There are many variations in between. I've been
> working with the glaze for a few years and am always surprised with the
> variation in results.
>
> I do have a question about this glaze. We now have a new supplier for
> Spodumene, which is a more pure form of lithium, with less iron impurities.
> What am I going to do to maintain the beautiful orange/shino surface of the
> glaze when my humble supply of the old spodumene runs out?
>
> I also will say about the magnesium carb. that in work with low fire glazes,
> the surface of the glaze changed a lot from ^04 to ^06 temperatures, from a
> rough platelet to a more rounded bead.
>
> Have fun exploring..bamboo karen
>
>
Gail Dapogny on sat 9 sep 00
I've wanted for a while to try one of these crawl or expansion glazes, but
I am full of questions. Are there some basic recipes that contain
magnesium carbonate that are appropriate for certain temperatures? (I fire
to cone 9-10). Is the glaze below a basic one?
Also, can one of these glazes be used over another glaze, and what will
that effect be? (I.e. will it leave the bottom layer glaze in place or will
that be affected also?)
Thanks to anyone who replies. ----Gail
>> I have used magnesium carbonate, perhaps 3% in a glaze to get the glaze to
>> crawl. The magnesium carb. is the magic element.
>> This started by using Tom Coleman's P.D. Shino Crack glaze. It's a ^10
>>glaze
>> that I fire a bit hotter.
>>
>> custer feldspar 8.0
>> spodumene 11.26
>> soda ash 2.96
>> epk kaolin 25.93
>> Neph syneite 37.04
>> OM4 ball clay 11.11
>> Magnesium carbonate 3.70
>>
>> The application is somewhat important, the thicker the glaze the more it
>>pulls
>> into beads to the point that the glaze will pull away from the clay body in
>> beads, leaving the raw clay surface. With a thinner application one gets a
>> crackle/rough surface. There are many variations in between. I've been
>> working with the glaze for a few years and am always surprised with the
>> variation in results.
Gail Dapogny
1154 Olden Road
Ann Arbor, MI 48103-3005
(734) 665-9816
gdapogny@umich.edu
www.silverhawk.com/ex99/dapogny
Jeff Lawrence on tue 12 sep 00
Hello,
A lot of my local volcanic ash glazes crawl like a bed of larvae. The beaded
surface after the first firing completely disgusts my wife. This effect is
so bad that she won't have them in the house.
Attempting to salvage a green-beaded one that I liked, I dunked it in a mat
white and refired it. I liked the result a lot (and She Who Must Be Obeyed
suffers it in the cupboard). The beads flattened out into flat plates bedded
in the overglaze color. The effect was like reptile scales, or some type of
stone; the "scales" could not be felt, but were visually very distinct.
If I try it again, I'll plan the colors in advance, though. You can't lean
on serendipity very hard.
Jeff Lawrence ph. 505-753-5913
Sun Dagger Design fx. 505-753-8074
18496 US HWY 285/84 jml@sundagger.com
Espanola, NM 87532 www.sundagger.com
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