THE CHARACTERIZATION OF TREATED AND DYED HAIR

Studies have been undertaken to evaluate some of the factors that infl uence the dyeing of hair with dyes fi om the Arianor series. Dyed, ble ached and untreated hair was examined by differential thermal analysis , optical microscopy, scanning electron microscopy, X-ray diffractomet ry and surface potential assessment. It has been found that marked cha nges in surface potentials arise on relatively mild treatment of human hail. Also clear are changes in the accessibility of the hair to dyes on treatment with various cosmetic systems. These changes have a mark ed influence on the nature of the dyeing process and on the hair/dye c omposite.