Visual Encyclopedia

Blue

Blue is one of the three primary colours of pigments in painting and traditional colour theory, as well as in the RGB colour model. It lies between violet and green on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colors; azure contains some green, while ultramarine contains some violet. The clear sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called Tyndall scattering explains blue eyes. Distant objects appear more blue because of another optical effect called atmospheric perspective.

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There's an art exhibit in August 2013 all about "the blues". "It might be a song, or it might be a mood, it might simply be a hue. Over a dozen artists share their unique takes on the BLUES this August at Lane Gallery"

Contributed by Kathryn Vercillo

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