The colour brown does not exist on the colour spectrum.

An article by the National Centre for Biotechnology Information (NCBI) states that brown is not a spectral colour.

An article by the National Centre for Biotechnology Information (NCBI) states that brown is not a spectral colour.Brown is not a spectral colour and usually refers to a combination of the high-wavelength hues. The other colours which have their own wavelength have to be mixed to perceive the brown colour. The term where brown can cover a wide range of the visible spectrum mostly inclusive of the different shades of orange and in particular is frequently recognized as dark orange. Brown is a composite colour.

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