Buy L"anza Hair & Scalp Treatments - L"anza Healing ColorCare Color Preserving Trauma Treatment 33.8 oz (1 Liter). How-to-Use: Use as a leave-in: Apply to towel-dried hair and leave-in for continuous healing action. Style as desired. Use as often as needed to heal traumatized hair. Regular use will improve color attachment during color services and improve color longevity after color services.