抄録
Since the main purpose of using hair colors is to impart colors on human hair, the accuracy of color, the ease of use and safety are very important considerations. In this report, two types of hair colors including oxidative hair dyes and semi-permanent hair colors using acid dyes will be selected to explain the main functions and mechanisms of hair colors. The methods of evaluating hair dye performance and quality, design of formations and other techniques necessary for product developments will be de discussed. In addition, colors of Japanese hair and evaluation of hair colors for professional salons will be also discussed.
