Hair dyes are common worldwide among men and women and there are many products and techniques available. However, there is only one chemical (and its derivatives) that can transform gray hair to a dark color, and that is paraphenylenediamine (PPD). Eugene Schueller was the first person to employ PPD in 1907 to color hair. His company, The French Harmless Hair Dye Company, became L’Oreal. The first company to use PPDs in the US was Clairol. A former chemist for Clairol and Unilever wrote, “It is most probably true that if these materials [PPD and its cousin PTD] were invented today, their use in cosmetics would not be permitted but they remain in use as no effective replacements have been found.” Hair dyes work by opening up the cuticle and cortex of the hair, using ammonia or MEA, removing the color that is there, and placing a new color (a coal tar dye) in its place.
Rather than stripping hair of its color then bonding foreign dyes to hair using couplers, oxidizers and harsh chemicals, Hairprint works by replacing the missing pigment common to brown and black hair. During a Hairprint treatment, new eumelanin is synthesized within the cortex structure of the hair restoring its innate color. This process is called melanogenesis and occurs constantly in the human body. Hairprint creates the precursors of eumelanin, relatively small monomers that penetrate the cuticle layer into the cortex where they form eumelanin pigments that polymerize and become too large to be washed or abraded out.
Please watch our short VIDEO with the inventor of Hairprint®, Dr. John Warner, as he explains further how Hairprint works.