- Each wavelength of light at full saturation and brightness is perceived as pure colour.
- A monochromatic colour is a colour produced by a single wavelength of light.
- Colours produced by a narrow band of adjacent wavelengths often appear to be pure colours.
- Spectral colours are the pure colours associated with an atmospheric rainbow.
- Rainbow colours include red, orange, yellow, green, blue and violet but the human eye can distinguish other pure colours between each one.
- In a continuous spectrum of sufficiently close wavelengths, separate colours are indistinguishable.
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