This worked like a dream. I had level 7 auburn hair, almost to my waist, that I had been coloring with demi permanent colors over my natural blah blonde. I mixed up a batch of this stuff with 3 activator packets & 20 volume developer and left it on for about 30 minutes under a plastic shower cap. Then I mixed up another batch and added it to my roots for another 30 minutes under the shower cap. Presto chango my hair was the color of a banana. It worked perfectly. My hair did feel dry, but not overly damaged. I definitely recommend getting enough supplies for two batches if your hair is past your shoulder blades. I only got my second batch in case I needed to bleach twice, but I ended up using it. I also added 2 tablespoons of olive oil to it and still used every last drop. Luckily it bleaches so well I only needed to do it once.