CLAYS AND RAW MATERIALS › Colouring Oxides and Opacifiers › Copper Oxide

Transparent apple green under neutral or oxidizing conditions except in alkaline glazes when a turquoise blue is  produced deepening to transparent  persisian blue in strongly alkaline ones. In reduction a copper

red colour is produced  known as sang de  beuf.     

NOTE  -  when added to low solubility glaze , copper causes the solubility of the glaze to be greatly increased ,making it unsuitable for use on domestic wares in contact with food or drink. There is no problem with copper in leadless glazes. 1 -5 %addition.

Ref.COPO

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