I color my hair with henna, but my roots are gray and I don't have time to color it again for a couple more days. This morning I had a vague memory of Joan Rivers selling brown powder on TV for covering thin gray roots. I took the cocoa powder I use as eyeshadow/bronzer and brushed a little on my gray roots. It worked great! It was almost like a dry shampoo and blended in nicely. Smelled good too.