Schwarzkopf Good by Yellow Shampoo 300 ml. * Hair color shampoo Kills yellow / orange rust mites. * Shampoo containing concentrated blue and purple beads Use the pool every time to reduce sparkle, orange-yellow color, sulfate-free and pH4.5. Gentle for those who are sensitive Helps maintain dull gray hair color to last longer. * Used to adjust the hair color after bleaching immediately For those who want to do gray, silver, gray white, just bleach the hair. Got a very light yellow level. Then wash with Goodby Yellow shampoo and leave it for 20-30 minutes. The shampoo will adjust the hair color from Yellow to a gray-white tone immediately. * For those who do blonde hair but don’t like red-orange, the shampoo can adjust the hair to blonde. How to use: Apply shampoo on wet hair, leave for 5-30 minutes, then rinse thoroughly.