Use a low silica porcelain to craze test your glazes

Friday 7th February 2014

Cone 6 transparent glaze testing to fit Plainsman M370: Left and right: Perkins Studio Clear. The far left one is a very thick application. Center: Kittens Clear. The insight-live.com/glossary/71">porcelain for all is Plainsman P300. Why? Because P300 is much more likely to craze the glaze because it has a lower silica content (about 17% and only kaolin whereas M370 has 24% silica plus the free quartz that comes with the 20% ball clay it also contains). If a thick layer works on P300 it is a shoe-in to fit M370. If it also passes the oven:icewater test.

Pages that reference this post in the Digitalfire Reference Library:

Remove Gerstley Borate and Improve a Popular Cone 6 Clear Glaze, Glaze Crazing

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