I've had a few premature grays for the past few years, and by keeping my hair lighter I didn't really have to keep on top of them. I had my hair colored back to my natural dark brown, thinking that now I won't have to worry about the touching up of the roots. Wrong. The grays, while still few and far between, are more noticable against dark brown. So I think I'll take the Sally's route, rather than the alternatives, which seem to be spending $80 all the time to get it done professionally or frying it with drugstore hair color. What should I use? A semi-permanant? Would I get a 10 developer for that?