Cobalt blue
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. Commercial production began in France in 1807. The first recorded use of "cobalt blue" as a color name in English was in 1777. 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.
Shades of cyan
The first recorded use of "robin's egg blue" as a color name in English was in 1873.
Displayed at right is the colour medium sky blue. This is the colour that is called "sky blue" in Crayola crayons. This colour was formulated by Crayola in 1958. "Sky blue" appears in the 32, 48, 64, 96 and 120 packs of crayons.
At right is displayed the web color teal.