I have used many different types of hair dye, and I have found this one to be the clear winner. I have used it over pre-bleached hair and it has come out a vibrant, bright red, but I have also used it over my dark hair and it came out a gorgeous bright red. I had to use a few bottles as I have a LOT of hair, but it worked surprisingly well! Highly recommended, and last flamin' ages!! Bleached or not, you will still get a beautiful shade of noticeably red hair! -Just Leana-