Cyan is the color between blue and green on the visible spectrum of light. It is evoked by light with a predominant wavelength between 500 and 520 nm, between the wavelengths of green and blue.
Image: Nympheas 71293 3
Image: American Robin Eggs in Nest
Image: Lidded Funerary Urn (Lunghu Ping) with Dog and Dragon LACMA 53.41.3a b (cropped)
Image: Uranus clouds
Blue is one of the three primary colours in the RYB colour model, as well as in the RGB (additive) colour model. It lies between violet and cyan on the spectrum of visible light. The term blue generally describes colours perceived by humans observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called the Tyndall effect explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective.
Image: 2010. Донецк. Карнавал на день города 010
Image: Iranian Tiles 1
Image: Cyanerpes cyaneus Diergaarde Blijdorp, Netherlands 8a
Image: NASA Earth America 2002
