Chris Schafale on tue 21 mar 00
Ahoy, any glaze folk who aren't already on the way to NCECA!
Two questions:
1) If one calcines kaolin for use in a glaze (to bisque temps, say
cone 05), would that have any effect on the melt? I ask because I
tested a cone 6 glaze that had 30% clay, first with just ordinary
EPK, then with half the clay calcined. The version with the
calcined clay *seems* to mature about a cone lower -- does this
make sense, or am I imagining things?
2) Has anyone heard of a fired glaze being affected by salt?? I
have an iron red glaze, and I recently noticed to my distress that a
cup which had been sitting in the refrigerator for a couple of weeks
with chicken broth in it, had discolored. The surface looks almost
bleached -- a sort of gray-pink-red instead of the original deep red-
brown, and the discoloration only shows up when the surface is dry
-- when it's wet, it looks normal. The only thing I could think of in
chicken broth that might have such an effect was the salt, but I've
never heard of such a thing. Any ideas? The glaze, by the way,
had previously passed tests with acid and alkaline solutions,
without any discoloration.
Chris
Light One Candle Pottery
Fuquay-Varina, NC
candle@intrex.net
http://www.lightonecandle.com
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