I dyed my hair pink purple and after just one wash, the color completely faded, so I bought this product. At the time when the color faded, my hair was hard to bleach black, so it was very patchy (it looked like a two-tone dye). Plus, my hair was so damaged that even after two hours of strong fan wind, it wouldn’t dry, and the color was completely gone, making my hair almost platinum blonde! Photos 1 to 3 show my hair before using the color-correcting shampoo. Photos 4 to 6 show the condition after using the shampoo (left on for 5 minutes)! Photo 4 is right after washing, and photos 5 and 6 are after drying. Honestly... I didn’t expect the color to come out this well ㅜㅜㅜㅜ If I had known about this shampoo earlier, I would have just bleached at the salon and done this at home... It’s about five thousand times better than dyeing. The bleaching itself was patchy, so even when I dyed it at the salon, the color was uneven, but this actually covers the patchiness better and the color comes out really, really well!!!! This is my smartest purchase of 2023.