Silver shampoo, also known as purple shampoo, is used to neutralize yellow or brassy tones in blonde, silver, or gray hair. It contains purple or blue-violet pigments that counteract the unwanted warm tones, resulting in a cooler, brighter, and more vibrant appearance. This type of shampoo is particularly useful for maintaining the desired shade after hair coloring or for those with naturally light hair or gray hair that tends to develop yellow or brassy hues