This will then disappear and you may see the traditional red, white ... three types of colour receptors known as cone cells which each have different absorption spectra - red, green, and blue.

THE numerous absorption spectra of soluble substances which have been described hitherto, have referred as a rule to the solutions of the substances, and but rarely to the solid substances themselves.

White surfaces reflect all colours of light. When looking at a coloured surface, the colours which are reflected enter the eye, which determines the colour the surface appears. The two primary ...