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Bone ash was first used in ceramics by Thomas Frye in 1748 to make a type of Soft-paste Porcelain . In the late 18th Century , Josiah Spode further developed its use by mixing it with china Clay , Kaolin and China Stone to compete with the imported Oriental Porcelain .

Production usually involves a two stage firing where the first, biscuit, is without a glaze at 1280°C (2336°F) gives a translucent product and then glaze, or glost, fired at a lower temperature below 1080°C (1976°F).


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