PERMANENT WAVING AND PERM CHEMISTRY 115 proportional to the amount of the process still remaining, that is, (1-α). As such, our basic kinetic equation becomes as follows: 1 dα k dt α (14) It is des irable to eliminate the differential term hence, the previous expression is integrated: ¨ ¨ 1 0 0 1 t t t dα k dt α α α (15) Figure 10. Identifi cation of reaction front in hair treated with 0.42M, pH 9.2 ATG.

JOURNAL OF COSMETIC SCIENCE 116 and yi elds the following equation: In 1 kt α (16) In i den tify ing the applicability of various mechanisms, we borrow from the reduced time method of Sharp et al. (29). In this particular instance, we again use the aforementioned Figure 11. Absence of reaction front in hair treated with 0.42M, pH 9.2 cysteamine.

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