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These strong colouring oxides and compounds give an apple green colour under neutral or oxidising conditions, except in alkaline glazes when a turquoise blue is obtained.Whilst in reducing conditions a copper red colour is produced sometimes known as sang-de-boeuf. The carbonate form gives an evenly textured green glaze due to its fine particle size ( 3 - 7%)
NOTE - when added to low solubility glaze, copper causes the solubility of the lead to be greatly increased, making the glaze unsuitable for use on vessels containing food stuff or beverage.
Copper Carbonate CuCO3
3 - 7% addition