naturtint, I always get the (blk/brown), that's the ONLY brand of color that I can use on my scalp since I was told I have SD, all of the others that the hair dressers used caused scalp issues that's part of the reason for my SD.
I tried everything(that the hair dressers used), after the color my hair in the crown area would shed when I washed it, I was willing to try anything after, I was even considering coffee rinses, I read about some ladies using cocoa, I was gonna go that route also.
I came back here & snooped around some of the girls mentioned naturtint, so I ordered mine from luckyvitamin.com(Allstarhealth.com is cheaper), I had it here for about a month before I got up the nerve to use it, that's been about 5 or 6 months ago, & I've been going at every since, I LOVE IT, I even put it in myself with no problems what so ever, no scalp issues, it's easy, not messy.
of course I follow the directions when I use it, but when it's wash day every 7 days, I condition with carol's daughter's black vanilla hair smoothie, but it's great if I can use it & get good results I think ANYBODY can use it.(lol)