Color Lock Therapy is a conditioning treatment that seals the color after coloring for long-lasting color brilliance. It neutralizes alkaline and peroxide residues without weighing down the hair. For less hair breakage.Application: After rinsing color, but BEFORE shampooing, apply evenly to scalp and hair. Massage gently and leave on for 3 to 5 minutes. Rinse thoroughly. Add 3D Color Lock Therapy to the matching 3-step care system for optimal results.