iandol on sat 17 jan 04
Dear Russel Fouts,=20
Sorry but I could not find a url to your image of the "Blizzard of White =
Spots".
I had a similar experience many years ago. When the pots came out of the =
kiln I knew immediately why. Laxly, I forgot to screen the glaze before =
applying it to the ware.
The cause. The batch of Zirconium Silicate I was using must have not =
been ground as thoroughly as it might have been or it had become wet at =
some time during storage and balled or caked into pellets.
Zirconium Silicate is highly refractory. It is reported as decomposing =
above 1540=BAC(CRC). We use it because it is insoluble to a fair degree =
in silicate melts, hence its power as an opacifier.
From your data I can discern no other cause.
Best regards,
Ivor Lewis. Redhill, South Australia
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