| 摘要 |
A method for providing a time-dependent decrease of pH in a cosmetic composition is described. A method of permanently shaping hair is also described, in which, immediately prior to use, an enzyme that catalyzes an acid-generating reaction with a non-ester substrate is added to an alkaline composition, which contains the non-ester substrate, to form a ready-to-apply cosmetic composition. Then the hair, before and/or after it is put in a desired shape, is treated with the ready-to-apply cosmetic composition and, after a period of action, is rinsed from the hair with water. Thereafter the hair is oxidatively treated, rinsed again with water, optionally put in a water wave and dried. Preferably the enzyme and the non-ester substrate are selected so that the initial pH decreases by at least 0.5 pH units within a time interval of from 5 to 40 minutes.
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