if you are going for a 9n or 10n your best bet is to bleach your whole head. bleach is not the best thing for it, but with the right conditioners and cleaners it should become healthy and heal properly. if you do bleach it, then the color should go on just right. if bleach is not an option for you, you may have to use any product that might lift the brown. also you may want to use a bigger developer. hope this helps you :) i will tell you from experience that lifting color is not easy, but hopefully you can get the job done!