Blacks can be made from many metallic oxide systems.
Brown-black through neutral black to blue-black, the blueness increasing as the cobalt content increases.
Stable to temperatures up to over 1300C. Will tolerate some reducing atmosphere. Stains containing chrome oxide have a tendency to flash or strike.
Suitable for blending with ceramic browns and with most other types of tin-free colors to produce intermediate shades.
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.
Body Color - Black
CoFeMn, CoFeMnNiCr stains are suitable for most types of bodies for firing at temperatures to 1300C+.
Glaze Color - Black
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.
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