Copper Carbonate

Cupric Carbonate
NOTE: Copper compounds must not be incorporated into any low solubility glaze if the resultant glaze is to be used on domestic wares in contact with foods

There is no problem with copper in leadless glazes

Many potters wrongly believe the problem with copper in leaded glazes to mean that copper is toxic in all glazes.Copper presents no hazard whatsoever no matter what form the copper is (except copper sulphate which is poisonous). The problem is the lead ions which are displaced from the glaze matrix by the copper ion


Painted onto clay: Black

Painted onto Biscuit: Black or green if thin

Painted onto unfired glaze: Green

Mixed into glaze: Green

Reduction firing:  Red