The Probert Encyclopaedia of Science & Technology

SMALT

Smalt is a type of glass in which protoxide of cobalt has been mixed with common glass to produce a glass with a deep blue tinge to it. Smalt was discovered by a Bohemian glass blower in the 16th century. The blue glass so produced may also be ground to a fine powder to produce a blue pigment, also called smalt, which was once used to tint starch and paper.
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