Understanding Yellow & Blonde Hair: The Role of Pheomelanin

Pheomelanin provides the yellow tones in yellow and blonde hair.

Here's a breakdown:

* Eumelanin: Provides brown and black tones.

* Pheomelanin: Provides red and yellow tones.

Blonde hair has a low amount of both eumelanin and pheomelanin, but the *presence of pheomelanin contributes to the yellow undertones* that characterize blonde shades.