Porcelain Glaze, which has an ultimate analysis of:
Silica 68, alumina 12, lime 14, soda/potassium 6.

39.6 FELDSPAR ra FELDSPAR
21.5 WHITING 14 BALL CLAY
9.7 CHINA CLAY i CHINA CLAY
29.1 SILICA 20.5 WHITING
31.5 SILICA

If these glazes craze on any clay body, in this

temperature range, it is extremely unlikely that it
is caused by the glaze.

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