I recently did a very dumb thing with my hair. I wanted to go a little darker, so i bought a color the basically turned my hair black. After a very emotional day, I went to my local beauty store and asked what i could do about it. she told me about a shampoo cap. It is all equal parts of shampoo, bleach, and 20 developer. i left it on for 5 min, and it did take the awful black hue from my hair leaving it a nice dark aburn brown. i did have to do a protein treatment afterwards, because im sure that this is very damaging. But it did give me results. You just have to keep your eye on it. I would suggest no longer then 5 minutes, because the hair dye will fade, I just needed something because I am impatient, and I looked awful!