I had dyed my hair a black about a year ago, and my hair has kind of grown out and the ends have faded, so from the top of my head, I have my natural hair color, and that goes into the kind of faded black that is now a dark brown, and then last its back to where the black has faded completely and it back to my natural color again. Is there anyway to lighten the dark brown color that I now have in the middle of my hair?