A healthy way to fight the grays? It finally exists! John Warner, a co-founder of the discipline of green chemistry (which uses non-toxic molecules over synthetic chemicals), and a small team of scientists have developed a new and truly revolutionary way to treat gray hair. Made of food-grade nontoxic ingredients, Hairprint puts the eumelanin protein back into the cuticle of your hair, restoring it to its original color. Suitable for those of us with brown or black hair.