My hair is a very dark brown. About three years ago, it started to fade a bit and then more and more white (not grey) hair started to sprout, mostly around my hairline. I started coloring it to it's "natural" color at the lon. The salon I go to is an a Aveda salon, and the dyes they use are vegetable base. I get a lot of compliments about how shiny my hair is after I get it colored. I try to do it every 3 months or so, but I'd do it more often than that but for the expense. I get it highlighted about once a year, too. Nothing dramatic, just some subtle strands around my face. I have fine hair and I wear it long and one benefit of the coloring is that it plumps my hair, making it seem thicker.