254 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (8) H. Arbenz, The pH value of normal skin surfaces, Dermatologica, 105, 333-353 (1952). (9) A.M. Kligman and E. Christophers, Preparation of isolated sheets of human stratum corneum, Arch. Dermatol., 88, 702-705 (1963). (10) P. J. Frosch and A.M. Kligman, The Duhring chamber, an improved technique for epicutaneous testing of irritant and allergic reactions, Co,tact Dermatitis, 5, 73-81 (1979). (11) P. J. Frosch and A.M. Kligman, The soap chamber test, a new method for assessing the irritancy ofsoaps, J. Am. Acad. Dermatol., 1, 35-41 (1979). Edward A o Tavss Edward Eigen Colgate-Palmolive Research Center Albert M. Kligman Department of Dermatology University of Pennsylvania
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