Cobalt Blue Glassware, Smalt. Cobalt Glass Known As Smalt When Ground As A Pigment Is A Deep Blue Coloured Glass Prepared By Including A Cobalt Compound, Typically Cobalt Oxide Or Cobalt Carbonate, In A Glass Melt. Cobalt Is A Very Intense Colouring Agent And Very Little Is Required To Show A Noticeable Amount Of Colour.

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agent amount blue carbonate cobalt colour coloured colouring compound deep glass glassknown glassware ground intense known little melt noticeable oxide pigment prepared required show smalt typically