Cobalt Carbonate CoCO3 - for ceramics

Cobalt carbonate has a lower cobalt content than Cobalt oxide but is easier to mix evenly and melts more easily. 1-3% Cobalt carbonate produces deep blues in leadless glazes, or a blue-black in lead glazes, or a vivid blue in alkaline glazes. The presence of Magnesium gives a more purple tint.