My step sister does salon stuff like that, She dyed her hair for as long as I can remember, She doesn't seem to have any hair damage at all. So I think you'd be fairly safe. But in terms of color, What exactly do you have in mind? And if you want hair like your brother why not find what kinda hair color he has and find a dye for it? I'm no expert at all in this kinda thing so I can't exactly give advice on this stuff