Definition: A term associated with the firing of porcelain, and applied to the fired article before glazing. May be any stage after the fluxes have flowed enough to provide rigidity to the structure up to the stage where shrinkage is complete. Referred to as low, medium or high biscuit, depending on the completeness of vitrification, also as hard or soft biscuit.
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Examples: glitazone, GI cocktail, etc.