2009 年 65 巻 10 号 p. 276-281
Gromwell Root and Sappan Wood were extracted to prepare 8 different semi-permanent hair dye formulations under pH 3, 4, 5, 6 and 7, 8, 9, 10, respectively. One commercialized hair dye was tested as the standard. Hair, after 8 shampoo washes with the Gromwell Root with pH 5 and Sappan Wood with pH 7, showed the best color differences, DE* 5.8 and 4.9, respectively, which were better than the DE* 15.54 from the commercialized fruit acid semi-permanent hair dye. By using a confocal microscope, the dyed hair after 8 shampoo washes still showed hair dye fluorescence below hair cuticle 0.01-0.03 mm.