I bought this because I'm trying to grow in my natural color, an ashy light brown that contrasted with my old highlights - now a brassy-gold. I mixed this with developer and applied. For the most part, it cooled my hair color way down. I had a few very pale highlights that this turned violet. The only thing I really didn't care for (besides the smell) was that it did dry out my hair a bit. It wasn't any kind of severe damage but I did baby my hair after using this. I will definitely turn to this again instead of trying to color my old highlights ash brown. It looks more natural.