Quote Originally Posted by Kes View Post
Dark hair just doesn't dye. You're going to have to bleach it first if you want the results to be noticeable. And when I say dark, I mean not blonde. I have several friends with light/medium brown hair naturally and they have to bleach it whenever they dye it.
I have medium-to-dark brown hair naturally and it dyes red without any bleach needed. It just depends on the products you use.