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Cobalt is a cool, slightly desaturated blue colour, historically made using cobalt salts. It was discovered by Louis-Jacques Thenard in 1802. The world leading manufacturer of cobalt blue in the 19th century was Blaafarveværket in Norway, led by Benjamin Wegner. It is extraordinarily stable. Chemically it is a cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl2O4. Commercial production began in France in 1807. It is made by sintering the stoichiometric mixture of finely ground CoO and Al2O3 at 1200°C.
Additional recommended knowledge
The first recorded use of cobalt blue as a color name in English was in 1777. 
Cobalt blue in human culture
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Cobalt_blue". A list of authors is available in Wikipedia.|