Joseph Fireborn
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I will conquer this black clay bloating problem if its the last thing I do on this earth!
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Seattle Pottery claims their vashon series goes to ^6, as well as their crystal white porcelain. All of those bodies bloat like a gassed-up politician. Sooooo...either the clay's being over-fired, or your kiln might be a bit too hot.
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Maybe, but others have stated they have fired to cone 6. I use self supporting witness cones. I am not over firing, if anything under firing. I go to about 5.5.
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Good luck
I have no idea about bloating.
I have no idea about bloating.