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Same body, glaze, thickness and temperature. Why did the front one foam up?

The glaze is G3933A, and the clay body is Plainsman Coffe Clay. The front tile was fired using the C6PLST schedule that just goes to cone 6, holds for a short time and then free falls. The body is stained with raw umber, that material has a high LOI and gases right around cone 6. During the short hold at cone 6 the glaze percolated and foamed up with bubbles. The shut-off froze that in place. The mug behind was fired using the C6DHSC drop-and-hold and slow-cool-firing. The drop-and-hold shuts off the gas expulsion of the umber and gives the glaze a chance to shed the bubbles. The slow cool gave it lots more time to smooth out and heal every single pinhole - the result is dramatically better.

Same body, glaze, thickness and temperature. Why did the front one foam up?

Links

Glossary Drop-and-Soak Firing
A kiln firing schedule where temperature is eased to the top, then dropped quickly and held at a temperature 100-200F lower.

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