What is the term for the natural pigment found in hair?

The natural pigment found in hair is known as melanin. Melanin is a complex polymer that contributes to the color of hair, skin, and eyes. The amount and type of melanin present in the hair shaft determine its color, whether it be black, brown, blonde, red, or gray.

Keratin, while it is an important structural protein that makes up the majority of the hair strand and gives it strength and resilience, does not play a role in the pigmentation process. The cuticle refers to the outermost layer of the hair shaft, serving primarily to protect the inner layers and is not related to pigmentation. Trichoptilosis, commonly known as split ends, pertains to a condition of the hair and does not describe hair's natural pigment. Understanding that melanin is responsible for color provides insight into the various shades of hair and the biological factors at play in hair design and care.