This is my edit of EA hair color presets. My goal was just to add more contrast for mm hairs and to get rid of those greenish-yellowish undertones (black one with originally pitch black highlights and a weird af brown being the biggest offenders).

Note that only 1 hair presets replacement can be installed. If the replacement doesn't work from the packages folder, put it in overrides instead

Unfortunately it will not change hair colors of sims that already exist in your game, unless you change it in CAS. The good thing - new generated sims and newborns if they don't inherit parents' haircolours will pick edited presets