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Cobalt Blue is considered "true blue." In the 16th century, cobalt ore was commonly seen shimmering in the lights from miners' lamps inside silver mines. The miners named the ore "Kobold"-Goblin. Cobalt Blue was first made from cobalt ore in 1775. Cobalt Blue pigment is perfectly lightfast and the most permanent of all pigments used to make artists' colors. It is expensive today for two reasons. The price of raw cobalt ore is controlled by the government of Zaire which depends heavily on cobalt mining revenues. And the cost of processing the ore into pigment is high because it consumes tremendous amounts of natural gas. Gamblin Artists' Oil Color, Cobalt Blue is well worth the price because of its working properties and unique color which cannot be mixed. Pigment: Oxides of cobalt & aluminum (PB 28), Vehicle: Alkali refined linseed oil, Lightfastness I, Series 5, Semi-Transparent
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