ok remember this ash is a grayish color sort of greenish Redis opposite thaton the color wheel so you should use a redish base and you can do it with an old fashion soap cap which is a batch of color and perioxude equal parts with equal parts of shampoo and wash is with that and wait and sort of test itl I think 15 to 20 minutes would be enough Just check that color wheel the someone you use for quilting or painting also you can run up to sallys supply and get some advise from them,..Good luvk