I had my hair professionally bleached to an almost platinum colour. I then tried to do my roots at home - 3 times...and every single time it turned out an orangey/goldish colour. I finally got close to the colour I needed on the fourth attempt but I still had some orangey/gold from the previous dye jobs. I got this to help bring down the yellow tones in my hair and it worked so well! Even my roommate noticed a difference after I used it. Now I use this every few weeks. I mix it in with my conditioner, I leave it on for about 5-10 minutes and then rinse it out. I love this product. It works so much better than a purple shampoo because it is so concentrated. Definitely recommend for those trying to keep their bright blonde hair colour!