This cone 04 mug has survived the thermal shock of a 300F to Ice-water IWCT test, one which a similar recipe failed badly. This is G1916T glaze on Plainsman Buffstone fired to cone 04 (the failing recipe was G1916Q). The difference? This one switches the Frit 3110 for Frit 3249.
G1916Q - Low Fire Frit 3195 Glossy Transparent
An expansion-adjustable cone 04-02 transparent glaze made using three common Ferro frits (low and high expansion) and a suspension strategy that produces an easy-to-use slurry.
Ask the right questions to analyse the real cause of glaze crazing. Do not just treat the symptoms, the real cause is thermal expansion mismatch with the body.