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Cyan is a greenish blue colour. It is evoked by light with a predominate wavelength of between 490 - 520 nm , between the wavelengths of green and blue.
In the subtractive colour system , or CMYK ( subtractive ) which can be overlaid to produce all colours in paint and colour printing , cyan is one of the primary colours along with magenta , yellow and black.
In the additive colour system , or RGBC ( additive ) colour model , used to create all the colours on a computer or television display , cyan is made by mixing equal amounts of green and blue light.
Cyan is the compliment of red , it can be made by the removal of red from the white light.
Mixing red light and cyan light at the same intensity will make white light. The web colour cyan is synonymous with aqua.
This nudibranch (Felimare californiensis) is making a comeback to a location it hasn't been to in years. First discovered off the coast of Southern California in 1902, it was thought to be extinct in the region since 1984 due to pollution. But the nudibranch, with its blue and gold color scheme (matching the University of California), has been spotted off the Southern California coast several times since 2003. Scientists have their fingers crossed that this indicates a larger comeback for the species.
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