OIL DEPOSITION ON SKIN Fzgure 3g. 4% Polyoxyethylene (5) soy- bean amine in mineral oil Fig.re 3h. 8% Polyoxyethylene (5) soy- 1)can amine in mineral oil Figure 3i. Mineral oil (technical) Figures 3a-3i. Effect of presence and concentration of various surfactants in mineral oil (technical) dispersed in water, maintaincd at 40øC, on skin coverage of deposited oil films derivative A, with the lower spreading coefficient value, appears to achieve superior coverage of the skin than lanolin derivative B. A significantly higher spreading coefficient value was obtained for lanolin derivative C, which exhibited poor deposition and coverage of the skin (Table IV). The deposition of oil on the skin from aqueous dispersions of various vegetable oils appears to be unsatisfactory, due to their spotty nature (Figs. 2o and 2p). Significant differences in the amount of oil deposited on the skin were recorded in order of decreasing affinity: corn oil cottonseed oil almond oil.

620 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Table V illustrates the effect of the presence of various surfactants at different levels in mineral oil (technical grade) on oil deposition on the skin after immersion in aqueous dispersions. From the results, it would appear that increasing the concentration of surfaetants above about 4% results in a decrease in the ameunt of oil deposited. The amount of oil deposited appears to be unaffected as long as the concentra- tion of the surfaetant remains below a certain level. This level appears to be between 4-6% for polyethylene glycol 400 dilaurate, polyethylene glycol 400 dioleate and polyoxyethylene (5) soybean amine. The critical concentration for polyoxyethylene (5) tallow amine appears to be between 0-4•. The addition of 4% surfactant to mineral oil (technical grade) results in a dramatic increase in spreading coefficient values. Addi- tional increases in surfactant concentration to mineral oil does not ap- pear to affect significantly the spreading coefficient values (Table VI). Similar results were observed by Paruta e! al. (17). Figures 3a to 3i illustrate the effect of the presence of various sur- factants at different levels in mineral oil (technical grade) on the skin coverage of the deposited oil film. These photographs demonstrate that the area covered by the deposited oil film remains the same as that of the original oil, regardless of the concentration of surfactant, However, with increasing concentrations of surfactants, the amount oi oil deposited is reduced, as may be seen by the decrease in the intensity of fluorescence. From the data presented, it appears that a relationship may exist between spreading coefficient values and the amount of oil deposited on the skin after immersion in an oil bath. No relationship could be ob- served between spreading coefficient values and the character of cover- age achieved by the deposited oil film. The surface area covered by the deposited oil film appears to be characteristic for the specific oil, and addition of various concentrations of surfactants does not appear to affect the area covered but rather the amount of oil deposited. SUMMARY The affinity to skin of various oils of potential use in bath oil formula- tions was investigated. The effect of the presence of various surfactants in mineral oil (technical grade) on oil deposition after immersion in an oil bath was determined.