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Prismatic and primary color between purple and green in the spectrum
Blue is one of the three primary colours in the RYB colour model (traditional colour theory), 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 that’s between approximately 450 and 495 nanometres. Most blues contain a slight mixture... Wikipedia