Lisa Clapp on sat 2 jun 01
There was a flurry of messages in regards to Pete Pinnell's weathered bronze
green glaze, cone 6, in April. I have since tested it and fallen in love
with the glaze, but found it detrimental to my ware. Any ideas on what I'm
doing wrong?
I fire to cone 6 electric, I've sprayed the glaze on the exterior of a
teapot, several vertical lidded jars and a rounded vase. All of them have
had glossy or satin glazes used as liners. Only 3 out of 8 have survived
the glaze firing. The ruined pots have all cracked horizontally. I've never
had this problem before. The cracks are always on the outside of the pot,
sometimes going all the way thru the wall of the pot, sometimes invisible
from the inside of the pot. I have tried 3 different liner glazes with the
weathered green glaze and not one consistently works. Does this have to do
with coefficient of expansion? Have those of you who've been using this
glaze run into this problem also? Do I need to use a liner with a higher
coefficient of expansion? According to my hyperglaze, WBGreen is 90 and my
liners are between 65 and 80 (x 10-7).
Any help is greatly appreciated!
- lisa clapp in the coast mtns of Oregon
Jim and Marge Wade on sun 3 jun 01
I haven't had any problems with cracking. However I have found what I
consider to be "ruined pots" when the glaze has not applied thick enough.
When this has happened the "thin" areas (even thought they look evenly
coated when glazed) are a tan color, almost looking as though the glaze has
been wiped off. I unload a kiln last week and had several pieces turn out
like this. Quite discouraging. A larger bowl did turn out nicely, but I made
sure I had a good coating of the glaze on it. I pour or dip most of my
glazes and have never tried brushing this one on. If I did I would probably
put three coats on for starters.
I'm always opened to suggestions with this glaze.
I've also been testing Will Edwards Shocking Shino. I especially like it
with his Matte Base with dolomite. A great reduction-look glaze in ^6
electric.
Marge
> From: Lisa Clapp
> Reply-To: Ceramic Arts Discussion List
> Date: Sat, 2 Jun 2001 21:26:26 -0700
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: PP's weathered bronze green
>
> There was a flurry of messages in regards to Pete Pinnell's weathered bronze
> green glaze, cone 6, in April. I have since tested it and fallen in love
> with the glaze, but found it detrimental to my ware. Any ideas on what I'm
> doing wrong?
>
> I fire to cone 6 electric, I've sprayed the glaze on the exterior of a
> teapot, several vertical lidded jars and a rounded vase. All of them have
> had glossy or satin glazes used as liners. Only 3 out of 8 have survived
> the glaze firing. The ruined pots have all cracked horizontally. I've never
> had this problem before. The cracks are always on the outside of the pot,
> sometimes going all the way thru the wall of the pot, sometimes invisible
> from the inside of the pot. I have tried 3 different liner glazes with the
> weathered green glaze and not one consistently works. Does this have to do
> with coefficient of expansion? Have those of you who've been using this
> glaze run into this problem also? Do I need to use a liner with a higher
> coefficient of expansion? According to my hyperglaze, WBGreen is 90 and my
> liners are between 65 and 80 (x 10-7).
>
> Any help is greatly appreciated!
>
> - lisa clapp in the coast mtns of Oregon
>
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