Copper Oxide Black

COPPER OXIDE BLACKCOPPER OXIDE BLACK - (CuO) RED (Cu2O) (m.p. 2100o F/1149o C) are the two stable forms of Copper Oxide. Both forms are coarser in particle size than Copper Carbonate (also see Copper Carbonate). The more common of the two forms (in a glaze) is copper black (2%-5%). It is a strong flux used as a colorant to produce greens in oxidation and reds in reduction. Red Copper Oxide can be precipitated during reduction firings as a component of a copper red glaze finish. Other colors are turquoise in Soda based glazes, yellow-greens in Potash, and blue-greens in Barium. Copper Carbonate can be substituted for Oxide if the amount is doubled.