Smalt is a blue glass, ground into a powder. It was used as a pigment from the 16th to the 18th centuries. The blue colour comes from cobalt ions in the glass linked to oxygen ions in a tetrahedral geometry.
Smalt is a blue glass, ground into a powder. It was used as a pigment from the 16th to the 18th centuries. The blue colour comes from cobalt ions in the glass linked to oxygen ions in a tetrahedral geometry.