The process of firing pottery or ceramic items at high temperature for the first time to make them hard and porous, before adding glaze.
From 'biscuit' in its pottery sense (from the twice-baked origin), combined with '-ing' to form the present participle. This technical term became standard in ceramics manufacturing.
Potters call the first firing 'biscuiting' because both biscuits and bisque pottery are 'cooked' to hardness—the metaphor of cooking transformed clay pottery from wet, fragile material into something durable.
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