Results for zaffre

Definitions of zaffre:

part of speech: noun

The impure oxide of cobalt, which, melted with silica and potash, and reduced to powder, becomes the powder- blue of commerce.

part of speech: noun

Impure oxide of cobalt: the residuum of cobalt, after the sulphur, arsenic, and other volatile matters have been expelled by calcination. So that it is a gray or dark- gray oxide of cobalt, mixed with a portion of silica. When fused into a glass it is intensely blue, and is much used by enamellers and porcelain manufacturers as a blue color.