Abstract
Bleaching and permanent waving treatments have been done up to 5 times on virgin Japanese human hair. The colour of the hair became brown and the touch changed harder with increasing treatment times. When the treatment exceeded 3 times, the damage of the cuticle layers became remarkably and a part of cuticle was peeled off. FT-IR spectrum of the original hair showed amide I (~1640 cm^-1), amide II (~1530 cm^-1), amide III (~1230 cm^-1) and weak absorptions corresponding to cysteic acid overlapped at ~1040 cm^-1 and -1180 cm^-1. Intensity of the absorption at ~ 1040 cm^-1 increased with increase of treatment times. The original hair showed peaks at ~163 eV and ~169 eV on the XPS spectrum. The former peak is considered to be S-S bond of cystine residue and the latter is due to S-O bond of cysteic acid. To investigate the prevention of hair damage, chemically modified wool keratin was added in permanent waving agent and the bleaching and permanent waving treatments have been done. The. cuticle layers of treated hair using the wool keratin were hardly damaged even if the treatment was repeated for 3 times.
