Optical anti-yellowing serum with violet dye and heat protection for bleached or highlighted hair. The first serum with the perfect balance of neutralization and repair in a heat-protecting leave-in treatment for healthy-looking, cool blonde hair while blow-drying. Benefits: - neutralizes unwanted yellow and orange undertones - leaves a cool color result - heat protection. Application: Apply 1-2 pumps evenly to lengths and ends of washed, damp hair, or apply to unwanted areas every 2-3 days and blow-dry.