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Fired at cone 10, 6, 4 (top to bottom).
Porosities: Cone 10 - 3%, cone 6 - 8%, cone 4 -11%.
Fired shrinkages: Cone 10 - 6%, cone 6 - 5%, cone 4 - 4%.
Somewhere between cone 6 and 10 it turns color from red to brown. That color change probably brings with it tendencies to warp and bloat.
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Lizella Clay
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