So my boyfriend and I picked this up thinking it would be a fun alternative to whatever garbage we put in our hair anyways. We both dye our hair black but he had just recently got his trimmed down so it was back to its natural brown-y color and my hair has major roots and has faded. The procedure was long and arduous; we didn't particularly mind the heating of the caca and it smelled wonderful at first but later on it started to smell like burnt pot. We caked it on and waited for hours and the smell gave us both horrible head aches. Unfortunately the smell made my boyfriend sick (I'm putting this politely) and after 4.5 hours of having the stuff on our head and washing it off there were no results at all for him and minimal results for myself. Over all the caca made my hair a little bit shinier, but the effect didn't last too long. Don't waste your time with Caca noir, it takes for ever to do and the results are not worth it.