These structures are said to be responsible for the absorption of electromagnetic radiation that has varying wavelengths, based upon the energy of the electron clouds. Their structures have Aryl rings that have delocalized electron systems. Both dyes and pigments are coloured as they absorb only some wavelength of visible light. These are the substances which are used as colourants i.e. ![]() In our daily life, we know about many substances which have specific colours. ![]() Plants, animals, and minerals have been used as primary sources for colourants, dyes or pigments since ancient times. Colour is one of the elements of nature that makes human life more aesthetic and fascinating in the world.
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