Stain (blacks)

Description: CoFeMn, CoFeMnNiCr, CoFe Blacks

Notes

Blacks can be made from many metallic oxide systems.

Color Range
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Brown-black through neutral black to blue-black, the blueness increasing as the cobalt content increases.

Stability/Kiln Atmosphere
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Stable to temperatures up to over 1300C. Will tolerate some reducing atmosphere. Stains containing chrome oxide have a tendency to flash or strike.

Compatibility
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Suitable for blending with ceramic browns and with most other types of tin-free colors to produce intermediate shades.

Cost
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Moderate.

Note: This description is taken from information provided by Blythe Matthey and may or may not apply to stains of this family from other companies.

Related Information

Links

Oxide	Analysis	Formula	Tolerance

Materials	Stain
Typecodes	Colorant Metallic based materials that impart fired color to glazes and bodies.

Mechanisms

Body Color	CoFeMn, CoFeMnNiCr stains are suitable for most types of bodies for firing at temperatures to 1300C+.
Glaze Color	CoFe, CoCrFe stains are suitable for most types of transparent glazes. The tendency of cobalt-based colors to soften the fired glaze can be overcome by the addition of china clay or silica to the batch before the stain is introduced. Underglaze Color: Suitable for most types of glazes to 1300C+. In this application the best results are obtained with colors having a low cobalt content, minimizing the risks of cobalt diffusing into and tinting the glaze blue.

Body Color

CoFeMn, CoFeMnNiCr stains are suitable for most types of bodies for firing at temperatures to 1300C+.

Glaze Color

CoFe, CoCrFe stains are suitable for most types of transparent glazes. The tendency of cobalt-based colors to soften the fired glaze can be overcome by the addition of china clay or silica to the batch before the stain is introduced. Underglaze Color: Suitable for most types of glazes to 1300C+. In this application the best results are obtained with colors having a low cobalt content, minimizing the risks of cobalt diffusing into and tinting the glaze blue.

By Tony Hansen
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