A bowl (about 9 in diameter) and abut 7 in tall really warped quite a bit during glaze firing. It looked perfectly round after bisque firing but is quite irregularly shaped after glaze firing. What did I do wrong? (speckled clay body)
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Also just piggybacking off of what was already said, the reason is that it appears in the glaze firing and not the bisque is simply because the piece is getting hotter and reaching its full temperature. Any subtle irregularities that might not have been evident in the bisque can arise once the clay is brought up to peak temp (bloating, warping, etc)