Perhaps cone 9 is the temperature at which bubbles form, as this glaze has worked very well at cone 8 and cone 10 in the past..or maybe the soak was too long and the kiln over-fired..hard to know. I'm thinking that the soak must have raised the temperature considerably. The cone was bent half way over before the soak, and after the soak it had completely slumped flat, so there was alot of extra heat work applied. I'll refire some of the pieces at cone 8 and see if that cures the problem.
|Bottle-vase, approx 4 inches tall|
|Mug, mapprox 3.5 inches tall|
|Vase, approx 6 inches tall|
|Cup, approx 4 inches tall|
|Glaze run on cup above|
|Miniature vase, 2 inches tall|
|Vase with ash glaze, approx 3 inches tall|