The color of chemicals is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the chemical. What is seen by the eye is not the color absorbed, but the complementary color from the removal of the absorbed wavelengths.
The study of chemical structure by means of energy absorption and release is generally referred to as spectroscopy.
Read more about Color Of Chemicals: Theory, Colors By Wavelength, By Category
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