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Linda Calvert

bone china (unglazed)

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I don’t think there is a specific answer to your question. Your claybody will determine the optimum firing schedule, you want to go with as much heatwork as you can but not so much that the body starts to be overly soft and have excessive slumping. Since the body won’t have the benefit of additional fluxes from a glaze you might have to go hotter or soak longer than you would with glazed ware.

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Min-

Traditionally,  bone china is bisqued at  the clay body’s vitrification temperature and then glazed at a lower firing temperature. The ware is often supported during the bisque with stoneware or porcelain “setters to prevent warping.

Respectfully,

Fred

 

Edited by Fred Sweet

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Hi Fred, yes, but doesn't sound like the OP is using glaze, or maybe I read her question wrong? Agree with you that she might need to use supports.

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