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Here is what happens at cone 8, 7, 6 and 5 (top to bottom). Don't trust a kiln sitter or controller to accurately fire to cone 6, include a self supporting cone and calibrate your controller or kiln sitter to guarantee that firings do not exceed cone 6. Make sure the self supporting cone is bending correctly. Built in firing schedules are almost certain to overfire the kiln, manually program your controller to prevent losing ware made from using Coffee Clay.
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