Although permanent hair dyeing gives an advantage to wash fastness, it may introduce damages on hair skin from the oxidant used. On the contrary, when acid dyes are used for semi permanent hair dyeing, they show poor wash fastness in the absence of damages on the hair. In the present study, the milling acid dyes, such as C.I. Acid Red 114 was chosen to approach the appropriate conditions for semi-permanent hair dyeing. The chemical structures of dyestuffs were characterized by UV and FT-IR analysis. The maximum absorption wavelength determined by the UV-visible spectrum were 620 for the respective dyestuff of C.I. Acid Red 114. the dyeing solution containing solvents such as acetophenone(C6...