Blackbird clay
Revision as of 06:58, 24 July 2013 by (username removed)
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.
Authority
- Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942