Purple shampoo for grey hair, a type of hair care product designed to neutralize brassy tones, is a chromatically-correcting shampoo that employs purple pigments.
Since grey hair lacks melanin, which gives hair its color, it can often appear dull or yellowed. Purple shampoo combats this by depositing violet pigments onto the hair, effectively counteracting the unwanted tones and enhancing the hair's vibrancy and overall appearance.