抄録
Permanent waves belong to quasi-drugs and function as wave-forming agents or hair straighteners. However, merely having these basic function is no longer sufficient to meet today's consumers' needs. The modern permanent waves must be mild to hair and skin, have little oder, easy to use and allow easy styling.
To develop products that will fulfill these needs, it is important during the formulation stage to use objective evaluation methods which correspond to a real situation. In this report, rapid and simple-to-use instrument evaluation methods for permanent waves based on thioglycolic acid will be presented. Determinations of the effectiveness of formulations, effects on hair and oder problems will be discussed.
