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White light travels until it hits an object where it is absorbed by that
object, the pigments that determine the colour of that object reflect the
corresponding wavelengths, telling the human eye the colour of that
object. Proof of this can be clearly seen when four sheets of card of
different colours white, red, green and blue are hit by the same light
source, only the area where the light hits reflects the pigments with the
relevant wavelengths telling the Retina cone cells the colour reflected.
The area outside the beam of white light can only be seen as dark grey or
black by the rod cells of the Retina. (Fig 8.)
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