zaffer

Definitions:

  • An impure oxide of cobalt, used to produce a blue color in enamel and in the making of smalt.
  • The residuum of cobalt-producing ores after the sulphur, arsenic, and other volatile matters have been more or less completely expelled by roasting.
  • 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.
  • A <xref>pigment</xref> obtained, usually by <xref>roasting</xref> <xref>cobalt</xref> glance with <xref>sand</xref> or <xref>quartz</xref>, as a <xref>dark</xref> <xref>earthy</xref> <xref>powder</xref>. It consists of <xref>crude</xref> cobalt oxide, or of an impure cobalt arseniate. It is used in <xref>porcelain</xref> <xref>painting</xref>, and in <xref>enameling</xref> <xref>pottery</xref>, to produce a <xref>blue</xref> color, and is often confounded with <xref>smalt</xref>, from which, however, it is distinct, as it contains no <xref>potash</xref>. The name is often loosely applied to mixtures of zaffer proper with <xref>silica</xref>, or <xref>oxides</xref> of <xref>iron</xref>, <xref>manganese</xref>, etc.
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