Features an innovative FadeStopFormula that actively strengthens the anchoring of color molecules  New Luminescine technology transforms non-visible UV light into visible light for magnificent brilliance  Improves the natural contrast & shine of hair  Offers built-in color protection  Delivers color lock-in for up to 22 washes  Great for naturally blonde, sun-lightened hair  Recommended to use directly after or in between color/highlight services 