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Different colour photons are created by the different amount of energy
released from individual atoms, apart from varying in colour when massed
into individual wavelengths, those particular wavelengths vary in colour,
heat and length. (Please see Fig. 2)
The above wavelengths are joined with invisible wavelengths, radio and
infra red wavelengths at the cool end of the electromagnetic spectrum.
Ultraviolet, x-ray and gamma rays at the hot end of the electromagnetic
spectrum.
When all these wavelengths are mixed together they create an
Electromagnetic field (Light) Light travels for ever until it is absorbed
by something it hits.
Once light is absorbed into an object it reflects corresponding wavelengths
to the pigments within that object.