Dying the hair on your head has become a staple in society. But dying the hair under ... hair dye is OK to use. Opt for stand-out colors like Manic Panic Hot Hot Pink or Special Effects Blue ...
"A natural brunette can use a blue shampoo even if their hair isn't [dyed]," says De Leon. "If their hair picks up natural pigment from the [sun's rays], it can turn their hair brassy as well.