A: Adderley Ltd., made your teapot. They have made porcelain in Longton, Staffordshire, England, since 1906. Bone china is a term for a mixture of feldspar, kaolin and bone ash. Adding bone ash to the formula creates a snow-white body. English potters discovered the formula around 1800. They were searching for a way to produce china similar to hard paste porcelain made in China and the European Continent. At one time, all porcelain was made in China, thus the name “china.” Bone ash was the byproduct of animal bones, usually from cattle. Bone china and English china are interchangeable terms. As a rule, porcelain marked “Made in England” was made after 1921. Your teapot is circa 1921 and would probably be worth $50 to $75.
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