After bleaching and dyeing my hair deep gray, I found it hard to maintain, so I was looking around for solutions. My hairdresser recommended this color shampoo, so I bought it. I bleached my hair three times, but the gray color lasted longer than I expected! I think it also helps reduce any splotchiness. I left it on for about 5 minutes in the shower. I think they said not to use it too often, but I really hate when the color fades, so I used it about three times a week haha. If I bleach my hair another color, I’ll definitely buy it again. I heard other brands can stain your hands, but this one didn’t stain my hands or my nails, which is great! Kiu also recommended this color shampoo! I hope they release more colors. I highly recommend it, and I hope it sells well!