Therefore, if a child has lower Eumelanin concentration, he will likely have lighter hair color
and vice versa.
If more Eumelanin is present, the color of the hair is darker, and if more pheomelanin
is present, the hair is lighter.
There's Eumelanin, which gives rise to a range of brown skin tones,
as well as black, brown, and blond hair, and pheomelanin, which causes the reddish browns of freckles and red hair.