[Columbine]

I've seen dye for it, but it was for an asian hair type so if you've got fine, non-black hair, it'd probably do horrible things to it. And yes, probably takes a hell of a lot of bleaching. Often the extreme colour off-the-counter dyes in japan are designed for pre-bleached hair, so I'd consult a hairdressers if I were you. They do carry silver/grey dye for people with S&P hair who choose to go grey rather than revert to brown or whatever, and they'd be able to adjust it to your hair specifically or at least keep the damage down more than you doing it yourself with an imported homekit. Just expect a lot of "Really, are you sure?" type questions and a lot of hesitancy. It's not exactly a common request.