The Best What Are The Rarest Hair Colors References. Web some hair colors are associated with some ethnic groups due to observed higher frequency of particular hair color within their geographical region, e.g. Red is the rarest natural hair color in the world.

Web table of contents 1 6 rare hair colors: It’s too easy to head to a salon or box dye your hair to try out any color that you want. For example, natural red hair is the rarest hair color in the world.