Color Lock Complete Kit. Texture Management Through the Art of Keratin. Not Tested on Animals. Recyclable Color lock is where "clear color gloss" meets Simply Smooth keratin technology. An add on service without adding additional booking time, Xtend color lock creates strong, smooth, humidity free hair for approximately 4-6 weeks. Color lock will reduce curl up to 35% & eliminate frizz up to 75%. This Complete Kit yields approximately 1-2 Xtend color lock treatment applications & includes pre-clean purifying shampoo for treatment preparation, as well as Xtend color lock keratin replenishing shampoo, xtend color lock keratin replen.