Does anyone know why this happens? It seems to only happen on really heavily reduced alumina washed bricks. It is still one of those mysteries of the kiln for me, but i'm sure someone out there has done some research or has a good guess. These bricks are from the montevallo anagama, "Fat Bastard", which i think is dimensionally exactly the same as Jack Troy's big anagama - the one in his book, "Wood-Fired Stoneware and Porcelain."
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