208 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS c) z o 0.100 0.050 0.O00 NS -m z 0 4ø t 30 - 20- 10- 0 -10 NS -1 -2 C -3 A B C D E [] Control [] Treated Figure 9. a: NIR absorbance variation for the control and treated leg corresponding to the treatment for 4 weeks by the five products A, B, C, D, and E. b: Conductance variation in the same conditions. c: Score variation in the same conditions.

NEAR-INFRARED SPECTROSCOPY 209 REFERENCES (1) J. L. L•v&que, Physical methods for skin investigation, Int. J. Dermatol., 22(6), 368-375 (1983). (2) J. L. L•v&que, G. Grove, J. de Rigal, P. Corcuff, A.M. Kligman, and D. Saint L•ger, Biophysical characterization of dry facial skin, J. Soc. Cosmet. Chem., 82, 171-177 (1987). (3) D. Saint L•ger, A.M. Frangois, J. L. L•v&que, T. J. Stoudemayer, A.M. Kligman, and G. Grove, Stratum corneum lipids in skin xerosis, Dermatologica, 178, 151-155 (1989). (4) A. W. Fulmer and G. J. Kramer, Stratum corneum abnormalities in surfactant-induced dry scaly skin, J. Invest. Dermatol., 82, 171-177 (1987). (5) M. Gloor, G. Hirch, and U. Willebrand, On the use of infrared spectroscopy for the in vivo measurement of the water content of the horny layer after application of dermatological ointements, Arch. Dermatol. Res., 271, 296 (1981). (6) P. L. Walling and J. N. Dabney, Moisture in skin by near-infrared reflectance spectroscopy, J. Soc. Cosmet. Chem., 40, 151-171 (1989). (7) K. H. Norris and J. R. Hart, "Direct Spectrophotometric Determination of Moisture Content in Seeds," in Proceeding of the 1963 International Symposium on Humidity and Moisture: Principles and Methods of Measuring Moisture in Liquids and Solids, 4th ed. (Reinhold, New York, 1965), pp 19-25. (8) J. L. L•v&que and J. de Rigal, Impedance methods for studying skin moisturization, J. Soc. Cosmet. Chem., 34, 419-428 (1983). (9) J. L. L•v&que, M. Escoubez, and L. Rasseneur, Water-keratin interaction in human stratum corneum. Bioeng. Skin, 3, 227-242 (1987). (10) J. L. L•v&que and L. Aubert, M•thodes d'•tude du pouvoir hydrarant des cosm•tiques,J. Med. Esth., 54, 117-122 (1987).