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.
To remove oxide mistakes or for making a design, use a pencil eraser.
It won't smear like trying to wash the oxide off.
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