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cobalt blue
Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with alumina at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl2O4. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue. It is extremely stable and has historically been used as a coloring agent in ceramics, (especially Chinese porcelain), jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment smalt.
==Historical uses and production==
Cobalt blue in impure forms had long been used in Chinese porcelain,〔.〕 but it was independently discovered as a pure alumina-based pigment by Louis Jacques Thénard in 1802.〔 German translation from .〕 Commercial production began in France in 1807. The first recorded use of ''cobalt blue'' as a color name in English was in 1777.〔Maerz and Paul ''A Dictionary of Color'' New York:1930 McGraw-Hill Page 91; Color Sample of Cobalt Blue: Page 131 Plate 34 Color Sample L7〕 The leading world manufacturer of cobalt blue in the 19th century was Benjamin Wegner's Norwegian company Blaafarveværket, ("blue colour works" in Dano-Norwegian). Germany was also famous for production, especially the blue colour works (''Blaufarbenwerke'') in the Ore Mountains of Saxony.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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