SCANNING ELECTRON MICROSCOPY 529 (a) (b) (c) Figure 10. Same as Fig. 9, but all uplifting Bayers have been blackened on transparent overlay effects seen with the application of a cosmetic product correlate with a re- duction in the size and numbers of uplifting layers of skin. Water alone seems to have little effect on the stratum corneum and the primary mecha- nism of action of most 'typical commercial moisturizers seems to be one of plas- ticizing, lubricating, aaad even covering the brittle uplifting layers that are re- sponsible for the undesirable clinical effects. In any ease, the term "moisturi-

530 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (b) (o) Figure 11. Transparent overlay from Fig. 10 showing uplifting layers present (a) initially (12 per cent area black), (b) after 1 h (0.3 per cent area black), and (c) after 5 h (1 per cent area black) zation" probably does not properly describe the mechanism of action of the typical moisturizer prodnets presently being sold. ACKNOWLEDGMENTS The authors are grateful to the microscopists who actually took the SEM pictures (Carol Kazimir, Patricia Kaiser, John Ware) to Richard W. Swayne

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