LIPID DEPOSITION FROM BATH OILS 307 TEWL after the bath: Time course (g/m2 x h) 60 50 4O 0 20 40 so so •00 •20 Time (min) Changes from values before the bath TEWL-differences (g/m2 x h) lO -lO -2o -30 i • i o 20 40 60 80 lOO 12o Time (min) -•-Control • BD ß $td. Dev. Control + $td. Dev. BD Figure 3. Field 3. Time course of the transepidermal water loss after the bath (upper part) and differences from starting values (lower part). Means -+ standard deviations. *P O. 1 (BD vs control).

308 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS In conclusion, the results presented have shown differences in the deposition of lipids on the skin after bathing the forearms with or without addition of a bath oil. Floating bath oils seem to offer advantages over dispersible oils. As oil baths are the simplest and most effective method of lubrication for large areas of skin and particularly for aged skin, one should think carefully about the purpose of the bath and the type of the oil to be used. REFERENCES (1) E. Berardesca and H. J. Maibach, Dry skin and aging: What it is and what is isn't, Cosmet. Toiletr., 105, 25-26 (1990). (2) B. Idson, "Moisturizers, Emollients and Bath Oils," in Principles of Cosmetics for the Dermatologist, P. Frost and S. N. Horwitz, Eds. (C. V. Mosby Company, St. Louis, 1982), pp. 37-40. (3) P.M. Elias, Lipids and the epidermal permeability barrier, Arch. Dermatol. Res., 270, 95-117 (1981). (4) M. M. Rieger, Skin lipids and their importance to cosmetic science, Cosmet. Toiletr., 102, 36-48 (1987). (5) P.M. Elias, Epidermal barrier function: Intercellular lameliar lipid structures, origin, composition and metabolism, J. Controlled Release, 15, 199-208 (1991). (6) M. E. Stolar, Bath oils, ½lin. Med., 73, 31-36 (1966). (7) M. Gloor, Pharmakologie dermatologischer Externa (Springer-Verlag, Berlin, 1982) pp. 18-20. (8) M. Gloor, H. J. Voss, M. Kinke, and H. C. Friederich, Entfettung und Riickfettung der Haut bei K/Srperreinigung dutch tensidhaltige L/Ssungen mit Lipidzusiitzen, Therapiewoche, 32, 4236-4245 (1972). (9) B. Idson, Bath and bath products as moisturizers, Cosmetics and Perfumery, 88, 43•44 (1973). (10) M. Gloor, W. Falk, and H. C. Friederich, Ober den Einfluss der Badezusatzkonzentration und der Badetemperatur auf den riickfettenden Effekt von Olbadezustzen, Der Hautarzt, 26, 589-592 (1975).