with Kadus Fervidol Color & Care. This true temporary color can retain, refine and even change the tone of hair color. For instance, if you spend time in the sun on vacation, color seems to get dull. Simply add Fervidol Color & Care to your regimen once a week and your blond stays luminescent. Your stylist can custom-blend the perfect Fervidol Color & Care shampoo-in color just for you. They can even give you a color enhancer and deep conditioning treatment in one 20-minute salon service. Add longevity and luster to your hair color with Fervidol Color & Care!