| http://www.w3.org/ns/prov#value | - Moderately ground cobalt glass (potassium cobalt silicate)???called "smalt???has been historically important as a pigment in glassmaking, painting, pottery, for surface decoration of other types of glass and ceramics, and other media.[1][2] Cobalt aluminate, also known as cobalt blue,[3] can be used in a similar way.
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