Why is this crystalline glaze not crazed? Even in the pool at the bottom?

Monday 8th June 2015

Because this is Plainsman Crystal Ice, it contains 40% insight-live.com/material/1245">silica (quartz). It also does not vitrify, so as much of the quartz remains undissolved as possible. This produces a body with a much higher thermal expansion so it can put more of a squeeze on the high-expansion glazes used in the crystal glazing process (it is very common for such glazes to be crazed, it is accepted as part of the process).

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Crystalline glazes, Calculated Thermal Expansion

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