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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. Cobalt glass plates are used as an optical ...
Blue Pale to deep blue. [20] Cobalt Blue A deep shade of blue and the most sought after. [20] Independence Blue 1975-76 A cobalt blue carnival treatment made during the U.S.Bicentennial. [21] Green This color ranges from a deep green to a light yellow green. [20] Marigold A yellow orange color. [20] Red A red color that is deep when held to a ...
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]
Elegant glass manufacturers produced vibrant colors that varied far more than Depression Glass. [1] Shades of red, blue, green, amber, yellow, smoke, amethyst, and pink were produced. An easy way to compare the difference in color quality is to take a look at a piece of cobalt Elegant glass and place it alongside a piece of cobalt Depression Glass.
The "mussel blue" is cobalt. The discovery in 1772 of a rich vein of cobalt in Norway, the junior part of the joint kingdom, was quickly developed using some nearby water power into an industry, grinding cobalt to a fine dust to incorporate in ceramic glazes and glass manufacture. The mellowed Blaafarveværket site is a tourist attraction today ...
Details of the process and the composition of the glass vary and so do the results, because it is not a simple matter to obtain or produce properly controlled specimens. [5] 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 ...
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