Water-logging happens when a clay is underfired

Thursday 16th April 2015

The cone 6 glaze is well developed, it is not crazed. But the clay underneath is not developed, not vitreous. This crack happened when the mug was bumped (because of poor strength). It is barely visible. When the mug is filled with water, this happens. How fast? This picture was taken about 5 seconds later. If this was insight-live.com/trouble/2">crazing, and this piece was in actual use, the clay would gradually become completely water logged. Then one day someone would put it in the microwave! Boom.

Pages that reference this post in the Digitalfire Reference Library:

Maturity, Functional, Microwave Safe

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