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During the late 18th century Richard Champion, a Bristol merchant and potter, making Bristol porcelain, was working with a chemist, William Cookworthy. [1] Cookworthy began a search for good quality cobalt oxide to give the blue glaze decoration on the white porcelain and obtained exclusive import rights to all the cobalt oxide from the Royal Saxon Cobalt Works in Saxony. [2]
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.
Small concentrations of cobalt (0.025 to 0.1%) yield blue glass. The best results are achieved when using glass containing potash. Very small amounts can be used for decolorizing. 2 to 3% of copper oxide produces a turquoise color. Nickel, depending on the concentration, produces blue, or violet, or even black glass.
Milk Glass with a blue edge. [25] Black Rose 1953-54 Peach Blow with a black edge. [25] Blue Ridge 1939 French Opalescent with a blue edge. [25] Crystal Crest 1942 Milk glass with a double row of crystal and white glass. [25] Emerald Crest 1949-55 Also called Green Crest in 1949. [25] Gold Crest 1943-45 Yellow glass on the edge of Milk glass ...
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This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. ... Cobalt: 8.86: 25 (6.925 ...
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