| 摘要 |
An acidic two-bath type composition for the permanent waving of the human hair as well as for the treatment of the human hair and scalp, which consists of an aqueous reducing agent solution (the first bath) containing 3 to 10% by weight of at least one mercaptan acid such as, for example, thioglycolic acid or thiolactic acid and an aqueous oxidizing agent solution (the second bath) containing 1 to 10% by weight of sodium bromate, potassium bromate, or hydrogen peroxide, said reducing agent solution having a pH adjusted with a base to a value 0.1 to 2.0 lower than the isoelectric point of the hair or scalp and said oxidizing agent solution having a pH adjusted with an acid to a value 0.1 to 2.0 lower than the pH of said reducing agent solution but not more than 3.0 lower than the said isoelectric point. Although this composition can be used in a customary manner, it is preferable to apply the oxidizing agent solution having an initial pH 0.1 to 2.0 lower than the pH of said reducing agent solution but not more than 3.0 lower than the isoelectric point, and then, during the application, further adjusting the pH to a value lower than the initial pH. This composition is suitable for imparting a permanent wave to the human hair and for treating the human scalp and hair to enhance the physiological activity of the scalp and hair. The permanent wave of the hair treated with this acidic two-bath type composition is very stable and the scalp and hair treated with the composition is markedly improved in physiological activity.
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