I use it to remove the red or yellow tones for a more natural light blonde effect. It works. Product that is not bad. I apply it with a fairly large flat clamp on the roots. I leave on for 10 minutes without problems right then I rinse well properly for well cut the blue and no problems, no color on the towels, no intolerance to the product. We even by itself can result in progressively space the care. For the moment, I use once a week and it works from the 2nd time! It cleared my hair and I no longer need to go wicks in the spray supplement hairdresser blond gradual lightening effect (Dessange). And what a relief not to go there to get turned or for a result that means !!