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Hair colour is decided by the varying amounts of pigments contained in
the hair structure. Pigments are contained in two types of melanin
Eumelanin contains the dark blue pigments only. (Please see Fig. 13)
Phaeomelanin contains both the red and yellow pigments. Melanin is
found in the cortex and the matrix cement but not in the cuticle cells
which are completely three of melanin.
Cuticle cells work the same as prisms absorbing white light and splitting
it into individual colour wavelengths and reflecting the corresponding
wavelengths to the pigments.
