| abstract |
A method for time dependent decrease of pH in a cosmetic composition for treating skinnor hair, preferably a method for permanently shaping hair, for which, immediately beforenuse, an enzyme that catalyzes an acid-generating reaction with a non-ester substrate tonform a ready-to-apply cosmetic composition is added immediately (preferably 5 secondsnto 3 minutes) prior to use to an alkaline composition having an initial pH of 7.0 to 14 andncomprising a non-ester substrate,. Than the hair, before and/or after it is held in thendesired shape, is treated with the ready-to-use agent and, after the period of action, isnrinsed with water. Thereafter the hair is treated oxidatively, rinsed again with water,noptionally laid into a water wave and then dried. Preferably the enzyme and the non-esternsubstrate is selected so that the initial pH of 7.0 to 12 is lowered within a time interval ofnfrom 5 to 40 minutes by at least 0.5 pH units. |