184 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (4) P. Thau, in Surfactants in Cosmetics, M. M. Rierger, Ed. (Marcel Dekker, New York, 1985), p. 354. (5) D. B. Black, R. C. Lawrence, E. G. Lovering, and J. R. Warson, J. Assoc. Off. Anal. Chem., 66, 180 (1983). (6) H. Beernaert, M. Herpol-Borremans, and F. De Cock,.]. Food. Chem. Biotechnol., 42, 131 (1987). (7) M. P. Italia and M. A. Nunes, J. Soc. Cosmet. Chem., 42, 97 (1991). (8) S. Scalia, M. Guarneri, and E. Menegatti, Analyst, 115, 929 (1990). (9) S. Scalia, F. Testoni, G. Frisina, and M. Guarneri, J. Soc. Cosmet. Chem., 43, 207 (1992). (10) "Solvent Miscibility" and "Relative Solvent Strength on Silica Gel" provided by Applied Separations Inc., Allentown, PA. (11) Program written by G. L. Rathsmill, PennComp, PA. (12) D. Song, S. Zhang, and K. Kohlhof, J. Chromatogr. B, 658, 142 (1994). (13) D. Song, S. Zhang, and K. Kohlhof, J. Chromatogr. B, 660, 95 (1994). (14) D. Song, V. Khaykis, and K. Kohlhof, J. Chromatogr. B, 663, 263 (1995).