Hairprint is a patented scientific breakthrough that restores gray hair to its true color. It is not a dye. It replenishes the natural pigment (eumelanin) found in brown and black hair that has turned gray. Hairprint is also a true protein treatment that will add body, strength, texture, and sheen while reducing frizz, and discoloration. Our simple, hypoallergenic, and odor-free formula produces color so natural, it defies detection. The treatment can be applied at home in about 75-90 minutes.