SANDRA@ICICB.NCI.NIH.GOV on thu 25 apr 96
You all have been great at solving glaze puzzles--Here's mine.
I've been using a Cone 6-9 oxidation Faux Celadon glaze on porcelain
(Standard Ceramics). It looks quite a bit like a real celadon except a bit
darker. It was fine until about a year ago when I started getting pinholes
AND there would be a slight crawling in some places on the pot. The pot
needed to be refired each time, then the crawling healed. I tried applying
the glaze more thinly, but that didn't matter, I still got the strange bald
spots. Thinking it might be oil or dirt on the surface, I went over each
surface with a dry Scrubbie, then wiped them down with a damp
sponge. I still had bald spots. Pinholes appeared on the bottom of the
pots. (My pots have carved feet which raise the bottoms of the pots and
the bottoms get glazed.) For a while I thought it was just me, but a
colleague of mine used the same batch of glaze and had the same
problem.
I work in a cooperative studio and don't mix my own glazes, or do my
own firing, but the firing schedules haven't changed since I've been
working there (about 5 years). Here is the glaze formula:
Cone 6-9 Oxidation Faux Celadon
Soda Feldspar 2000
Wollastonite 800
China Clay 400
Flint 400
Gerstley Bor. 400
Copper Carb 20
Black Stain 8
Help! I have developed a line of pots with this glaze that sell pretty
well.
TIA, Sandy
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