Pigmentation

Pigments of colour are added to the hair early in the growth process. These pigments are made of a substance called melanin.

Melanin gives hair its natural coloured appearance.

The pigment granules in fully formed hair contain two key types of melanin: 

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Eumelanin:

Black/Brown (Ashen) has larger pigment.

The amount of Eumelanin determines the depth of the hair (How light or dark it is) 

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Pheomelanin:

Red/Yellow (Warm) has smaller pigment. The amount of Pheomelanin in the hair determines the tone of the hair (the colour you see).