Description
- Cobalt blue is a semitransparent pigment with low to moderate tinting strength.
- When it dries, it appears lighter and less saturated.
- Pigment particles are large and grainy.
- Differences in how the pigment is ground and mixed lead to considerable differences in its performance among various manufacturers.
- Since ancient times, smalt blue has been used to color glass and ceramics.
- Cobalt salts, which give smalt its characteristic blue color, were identified in the 18th century.
- Techniques for manufacturing Cobalt Blue, a chemically pure salt of cobalt and aluminum oxide, were developed in 1802.
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