Abstract:A more appropriate description for the light is as continuous and spreads sinusoidal motion (waves) described in terms of particles called photons. Dyes are organic molecules that selectively absorb wavelengths of light within the visible range of the electromagnetic spectrum and are capable of transferring color to materials. Their existence may date from 4000 BC. Three dyes of vegetable or animal origin were very important in ancient times: the indigo; purple and alizarin (madder). The first synthetic dye, t… Show more
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