L'Oreal Cristalceutic Radiance-Protecting Masque helps to repair the damaged fibers of color-treated hair while preserving color intensity and radiance. Protects color and ehances radiance for up to 8 weeks. Once or twice a week, apply a small amount section by section from mid-lengths to ends. Leave in for 2-5 minutes, comb through to detangle and rinse thoroughly.