Red is the rarest hair color, but to understand why that’s the case, you need a basic grasp of the science. There’s a lot ...

and there are two main forms of hair pigment. There's eumelanin and pheomelanin. Eumelanin is what we see in brunettes and darker-haired people, and pheomelanin is what we see in blonds and redheads.

The impact of UV radiation on melanin can vary by individual. The melanin in your hair can exist in two main types: eumelanin (black melanin) and pheomelanin (orange-red melanin). The amount of ...

and there are two main forms of hair pigment. There's eumelanin and pheomelanin. Eumelanin is what we see in brunettes and darker-haired people, and pheomelanin is what we see in blonds and redheads.