With The Chromatic Collection: Extras you can mix many colours for your sims hair, making their hair look unique. The extras consist on 4 different set of textures that you can combine in CAS and two extra styles per hair.
If you want to make your hair seem like it was bleached some time ago, roots is your friend. Give your sim some darker roots, or go green and give it some Billie Eilish vibes, that’s up to you!
More info and examples here
The The Chromatic Collection 1: Extras (Roots) Team
