Cerulean topic

Cerulean may be applied to a range of colors from deep blue, sky-blue, bright blue or azure color through greenish blue colors. The first recorded use of cerulean as a color name in English was in 1590. The word is probably derived from the Latin word caeruleus, "dark blue, blue or blue-green", which in turn probably derives from caelulum, diminutive of caelum, "heaven, sky". In classical times, cerulean was used to describe blue pigment, particularly mixtures of copper and cobaltous oxide.... full article at wikipedia