This Kerastase Fusiodose Neutral Treatment is specifically formulated to counteract unwanted yellow or brassy tones in hair, offering an anti-brass, restoring purple care experience. Ideal for maintaining the vibrancy and cool tones of blonde, lightened, or grey hair, this product works to neutralize discoloration while providing intensive nourishment. Use this targeted treatment after shampooing to revitalize your hair color and restore manageability.