Vince Pitelka on tue 7 feb 12
John Richmond wrote -
"From your description of the problem it appears the combination of the two
glazes is over firing. In other words boiling. If it were mine I would add
clay or alumina to increase the melt temp. It is just a thought."
And it would be a good thought, John, except that these are glazes we have
used for decades, and we do not overfire. Remember that we are specificall=
y
talking about what happens when you put a shino over another glaze. For us=
,
the two shinos in that recipe list generally bubble if placed over another
glaze. None of these glazes bubble up when used by themselves or in other
layered combinations - only when we put the soda-ash-containing shinos over
another glaze. I hope that clarifies things.
- Vince
Vince Pitelka
Appalachian Center for Craft
Tennessee Tech University
vpitelka@dtccom.net
http://iweb.tntech.edu/wpitelka/
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