Red Lead, a bright red powder used chiefly as a pigment in paint that is applied to iron or steel surfaces to protect them from rust. Red lead is also used in making glass, red pencils, and storage batteries, and in glazing pottery, enameling, and purifying alcohol. Red lead is made by heating litharge, or lead monoxide, in a current of air at a temperature of 900 F. to 950 F. (482 to 510 C.).

Formula: Pb2O4.