Color Lock is a density treatment exclusively for in-salon use. It seals the cuticles and locks color pigments into the hair immediately after the hair-coloring process, neutralizing alkaline and peroxide residues without weighing down the hair. NioProtect Technology increases breakage protection during shampoo stage by up to 50%Apply after rinsing off color. Before shampooing. Massage-in evenly to finish the coloring process. Leave 3 to 5 minutes. Rinse well and follow with appropriate 3-part System kit for optimal results.What it is: Color Seal Treatment is a density treatment exclusively for in-salon use. It seals the cuticles and locks color pigments into the hair immediately after the hair-coloring process, neutralizing alkaline and peroxide residues without weighing down the hair.