Highlighted brunette, blonde, and grey hair can become yellow and brassy over time. How does it work? Purple color is the opposite to yellow on the color wheel, the purple within the Purple shampoo formula, helps neutralize yellow tones. Purple shampoo is also known as Silver shampoo. Our new specialist color correcting Purple formula nourishes hair & neutralizes unwanted yellow, orange, and brassy tones in just one use, to help leave hair looking bright and beautiful. Suitable for blonde, highlighted, and silver hair.