Was Riven's hair color changed from Singed's biochemical toxins

It's because raging makes you age faster, thus she has white hair, gg

Her lore never cited her having any hair changing effects like Diana or Ashe. To my knowledge and headcanon i'd say she's probably just born with whiteish hair.

wtf did it? lol. imma call brunnete

I mean, if you look at Ekko, Fiora, and Vi, it's pretty clear that hair dye is something that does exist in the League universe.

Maybe that's Singed's new market, now that the whole chemical weapons thing isn't as popular anymore.

green

Maybe because of stress it became white?

Ashe has White hair due to true ice. IN FACT in taliyahs QA someone asked why has freljord tal White hair? answer was: because true ice does something with your hair. ashe liss seju and freljord tal use true ice as weapons( Magic ) and have White hair

You can't change what already is.