| Zaffer (zaffer) |
|---|
| n. | (?) |
|---|
| Zaf"fer |
| [F. zafre,
safre; cf. Sp. zafra, safra, It. saffera,
G. zaffer; all probably of Arabic origin. Cf. Zaphara.] |
A pigment obtained, usually by roasting cobalt glance with sand
or quartz, as a dark earthy powder. It consists of crude cobalt oxide,
or of an impure cobalt arseniate. It is used in porcelain painting,
and in enameling pottery, to produce a blue color, and is often
confounded with smalt, from which, however, it is distinct, as it
contains no potash. The name is often loosely applied to mixtures of
zaffer proper with silica, or oxides of iron, manganese, etc.
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