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".

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 When the pigment cerulean blue (shown in the color box to the right) was invented, it largely superseded all these prior pigments.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.

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.

Jon Hopkins (born 1979) is a London-based producer and musician who writes and performs his own melodic electronica and dance music. After starting his career performing keyboard for Imogen Heap, he's produced or contributed to albums by Brian Eno, Coldplay, David Holmes, and others. Hopkins composed the soundtrack for the 2010 film Monsters, which was nominated for an Ivor Novello Award for Best Original Score. His third solo album, Insides, reached #15 on the Dance/Electronic Album Chart in 2009,. His collaborations on Small Craft on a Milk Sea with Brian Eno and Leo Abrahams and Diamond Mine with King Creosote both reached #82 on the UK Albums Chart. In 2011 Diamond Mine was nominated for a Mercury Prize, which is annually awarded for best album from the United Kingdom and Ireland.

Jon Hopkins was born in 1979 in Wimbledon in the South of London, where he was raised. He first became aware of electronic music after hearing early house music on the radio at the age of seven or eight, and also became an avid fan of Depeche Mode and the Pet Shop Boys. These records inspired an early fascination with synths.