Blackbird clay

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Description

A proprietary term for a natural clay that fires to a dark brown or black color. The color of Blackbird clay is from manganese and iron impurities. It was used to manufacture black brick, terracotta floor tile, and pottery.

Sources Checked for Data in Record

  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942

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