Simply put, melanin is pigment, but there are two types of melanins that give hair color its own distinctive coloring. I already gave you the scoop on pheomelanin, the pigment that produces red and yellowish strands, so let's move on to eumelanin. As you might have guessed, eumelanin gives skin and hair black and brown coloring. Therefore, people with darker skin tones will have more of this color-determining substance.
There are two different types of this pigment: black and brown. The smaller amount of brown one has, the lighter or more ashen blond the hair will be. In turn, the higher the amount of brown, the darker or more brown the hair will be. As for black eumelanin, in high quantities, it's what makes the hair black. But in lower levels, it's responsible for causing the hair to become gray. So now you can dazzle your friends, giving them their own custom "hair reading," all thanks to your expert hair color knowledge.