390 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Results The results were treated in a fashion similar to those for the Florida sun- light study. They were ranked for protection from sunburn only. A score of 40.0 (Table VI) indicated no protection from burning. Table VI Artificial light Sample Total score 5/o of control 5/o protection G8/1 11.5 29 71 G8/2 7.0 17 83 G8/3 8.0 2O 80 G8/4 5.5 14 86 G8/5 1.0 2 98 G8/6 2.5 6 94 G8/7 30.5 76 24 G8/8 19.0 47 53 Control 40.0 100 0 Summary The results of this study (9) agreed in general with the results presented in the Florida sunlight study (8). From the artificial light study, it was difficult to judge tanning efficacy and the tanning results could not be considered conclusive hence the data are not reported. Later studies indi- cated that changes in technique lead to better evaluation of tanning. The artificial light (XeM) technique should be reserved for screening of new experimental products. It is not intended to be a substitute for natural sunlight in final evaluations. CONCLUSIONS The emulsion vehicles afforded significantly less protection against burn than did the oil-based formulas. G8/4, Lantrol © oil-based formulation, gave similar protection when compared to the other two oil-based types. In general the better sunscreen products did not give the best tanning results. However, oil-based formulation, G8/4 with Lantrol ©, not only gave between 86 and 92•o sunscreen protection, but was also effective in promot- ing tanning. (Received: 18th October 1971)

SUNSCREEN AND TANNING PREPARATIONS 391 REFERENCES (1) Willis, I. and Kligman, A.M. The evaluation of sunscreens by human assay. J. Soc. Cosmet. Chern. 20 639 (1969). (2) Private report No. M-9139, Rosner-Hixson Laboratories (August 1959). (3) Private report, Treatment of sunburn, J. V. Klauder (June 1959). (4) The moisturizing plus story (Maimstrom Chemical Corp., Linden, N.J.). (5) Frazer, C. N. and Blank, H. I. A formulary for external therapy of the skin, 55 (1954) (Bannerstone House, Springfield, Ill.). (6) Kreps, S. I. Spectrophotometric evaluation of sun screens. Proc. Sci. Sect. Toilet Goods Ass. 23 13 (May 1955). (7) Harry, R. G. Cosrnetics--Theirprinciples andpractices, 257 (1956) (Chemical Publishing Co., New York). (8) Private report HTS-5, Sun screen efficacy study (December 30, 1968) (Hill Top Research, Inc.). (9) Private report T-132, Evaluation of sun screen properties (artificial light) (May 1969) (Hill Top Research Inc.).