cobalt blue glassware smalt

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Looking downward on a collection of cobalt glass bottles near Bishop, California, USA - November 6, 2022 Royalty Free Stock Photo

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.