Copper carbonate supplies CuO. A colorant and flux.
Copper carbonate comes in various shades of green, reflecting various degrees of hydration. Pure copper carbonate (CuCO3) is about 64% CuO, whereas the basic carbonate (CuCO3 Cu(OH)2) is nearly 72% CuO. The basic carbonate is (in theory) easier to disperse in glazes due to its greater affinity for water. Prepared from Malachite (CuCO3 Cu(OH)2) and Azurite (2CuCO3 Cu(OH)2) or by chemical processes.
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