Blue is one of the three primary colours in the RYB colour model, as well as in the RGB colour model. It lies between violet and cyan on the spectrum of visible light. The eye perceives blue when obse
rving light with a dominant wavelength between approximately 450 and 495 nanometres.
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| Blue |
| Blue is the colour of light between violet and cyan on the visible spectrum. Hues of blue include indigo and ultramarine, closer to violet; pure blue, without . |
| Blue is one of the three primary colours in the RYB colour model, as well as in the RGB colour model. It lies between violet and cyan on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. |
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