Raw Material

CuCO3¡¤Cu(OH)2? A source of copper oxide (CuO) and a recipe substitute for the same by adding 40% more. 3% added to most glazes produces a clear green. In alkaline glazes the colour shifts to turquoise blue.? At 7% or more, metallic surfaces develop...

Pyrolusite ore. A glaze colorant typically giving browns, blacks and, at high concentrations, metallics. Manganese dioxide decomposes to MnO at 200? C, picks up O2 to become the dioxide and above 1080? C changes back to MnO, an active flux; glazes that...