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Wikipedia:
Cerulean, also spelled caerulean, is a color term that may be applied to a wide range of colors from deep blue, sky-blue, bright blue or azure colors through blueish green 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".
Use in artistic painting
In classical times, cerulean was used to describe blue pigments, particularly mixtures of copper and cobaltous oxides. These early attempts to create sky blue colors were often less than satisfactory due to greenish hues and lack of permanence. When the pigment cerulean blue (shown in the color box to the right) was invented, it largely superseded all these prior pigments. See also Tekhelet.
Cerulean blue
At right is displayed the color cerulean blue.
The first recorded use of cerulean blue as a color name in English was in 1859.
Pigments through the ages shows a "Painted swatch of cerulean blue" that is representative of the actual cobalt stannate pigment. This color swatch matches the color shown in the color box at right5.
Cerulean blue pigment
Discovered in 1805 by Andreas Höpfner, the pigment originally referred to as cerulean blue (or corruleum blue) was first marketed in 1860 as "coeruleum" by George Rowney of the United Kingdom. The primary chemical constituent of the pigment is cobalt(II) stannate.
It is particularly valuable for artistic painting of skies because of the purity of the blue (specifically the lack of greenish hues), its permanence (no other blue pigments retained color as well), and its opaqueness.
Today, cobalt chromate is sometimes marketed under the cerulean blue name but is darker and greener (Rex Art color index PB 36) than the cobalt stannate version (color index PB 35). The chromate makes excellent turquoise colors and is identified by Rex Art and some other manufacturers as "cobalt turquoise".
Other variations of cerulean
Pale cerulean
Pantone, in a press release, declared the pale tone of cerulean at right, which they call cerulean, as the "color of the millennium".
The source of this color is the "Pantone Textile Paper eXtended (TPX)" color list, color #15-4020 TPX--Cerulean.
Bright cerulean
This bright tone of cerulean is the color called cerulean by Crayola crayons.
Cerulean frost
At right is displayed the color cerulean frost.
Cerulean frost is one of the colors in the special set of metallic colored Crayola crayons called Silver Swirls, the colors of which were formulated by Crayola in 1990.
Dark cerulean
The color dark cerulean is displayed at right.
Cerulean in nature
Cerulean Cuckoo-shrikeCerulean KingfisherCaerulean Paradise-flycatcherCerulean WarblerCerulean-capped ManakinCerulean in human culture
Aerobatics
The United States Navy Blue Angels aerobatics team wears uniforms that are a rich bright tone of cerulean.Computer software
Cerulean Studios is a software house based in Connecticut, United States.Fashion
Cerulean was nominated by Pantone in 1999 as the "color of the millennium." (See the color pale cerulean above)Film
In The Devil Wears Prada, Miranda Priesly (Meryl Streep) makes a reference to a cerulean colored sweater, and other high fashion clothes items in Cerulean.in Rio, a newspaper article announces that Blu's owner, Linda, won the state spelling bee by spelling Cerulean. ("Cerulean for the win.")Literature
Cerulean Sins is the eleventh book in the Anita Blake: Vampire Hunter series by Laurell K. Hamilton.Music
Cerulean is the album title for the September 10, 1991 music release by the band The Ocean Blue.Cerulean is the first album by musician Baths_(musician)Science
Cerulean cyan fluorescent protein is a mutant of green fluorescent protein.Television
Repetition of the words "cerulean blue" is a method the "Pusher" villain uses at the beginning of the eponymous X-Files episode 17 season 3 in order to lull his victims to do what he wants.Video games
Azul the Cerulean is the blue-haired 33 year-old final recruit of the Tsviets in Dirge of Cerberus: Final Fantasy VII.Cerulean City is one of the pivotal locations in the game and anime Pokémon and is home to the Water Pokémon Gym in Kanto.
