- Things appear to have colour because they absorb some wavelengths of light and reflect others.
- The chromophore is the region of a molecule where there is an energy difference between two separate molecular orbitals.
- A molecular orbital describes the location and wave-like behaviour of an electron as it travels around the nucleus of an atom.
- If the energy difference of a chromophore falls within the range of the visible spectrum (2 to 2.75 electron volts) then it will produce colour.
- The colour produced by a surface or object is the one not absorbed during its interaction with the chromophore.
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