We’ve mentioned that there are two types of melanin which create distinct hair colourings. We’ve already defined one of them – pheomelanin, which creates red and yellowish hair. The second is eumelanin.
Eumelanin creates skin and hair with black or brown shades to it. Those with darker skin therefore have more of eumelanin than others.
The pigment is split into two types – black and brown. The smaller amount of brown a person has determines that their hair will be lighter, or an ashen blonde. The more they have, the darker brunette they’ll be.
Black eumelanin, in high quantities, makes the hair black. In lower levels, it ncauses grey hair.