Notes on Colour

the visible spectrum

an illustration of the visible spectrum

Spectral colour

Colour begins with light—light and the human eye.

Sunshine comprises many wavelengths of electromagnetic radiation. Our eyes respond only to a narrow range between the infra-red, which warms us, and the ultra-violet, which tans our skins. This range, the visible spectrum, contains a fairly even spread of wavelengths but our eyes respond unevenly. We see the range as bands of colour.