I am letting mine grow out too, I have had graying hair since high school. I alway had some sort of color on it but I have decided to let it grow out also. Since my color was a lighter one its not as noticiable as when someone has darker color on the ends. If its grown out 6 inches why dont you just get a new style that would rid you of all the colored hair...its a win win new color and new style. It might look completely different to you once all the old colored hair is gone