Grecian Formula Liquid with Conditioner Hair Color gradually restores lost color. It works for any color hair. Day by day, Grecian gradually replaces gray with natural looking color. You can stop anytime and leave a little gray or keep going until all the gray is gone. And it looks so natural no one can tell you colored your hair -- they'll just know you look great. Different hair colors are the result of different amount of melanin, nature's coloring protein. As melanin production decreases with age, hair turns gray. Grecian has the unique ability to replace lost melanin with a similar-acting pigment. You can regain just the right amount of lost color by applying Grecian for fewer or more days. Hair will look thicker and healthier because Grecian contains a hair-thickening ingredient that works by expanding the hair's diameter. Plus, it actually repairs and strengthens hair, reducing hair loss from breakage.