46 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS This effect is of considerable importance, not only in such products as lipsticks, but also in cosmetic creams, etc., as experience has shown that with the aid of acetoglycerides it is possible to formulate creams which retain their initial texture and consistency under varying temperature conditions. A most important consequence of this is that it becomes unnecessary to prepare a number of modifications of a product for use in different climates. STABILITY Acetoglycerides are extremely resistant to oxidation, and their heat stability is surprisingly good. The graphs below, in which Acetoglyceride S/C is compared with hardened whale oil and glycerol monostearate, show that only small increases in acid value and peroxide value result, even when the heating is prolonged. ,' f-?7 a.•:[L• fe I0o /$• ZOO

CHEMISTRY OF ACETOGLYCERIDES AND THEIR USES IN COSMETICS 47 PHYSIOLOGICAL •EFFECTS Intensive investigation of the dermatological and physiological properties of acetoglycerides have shown that they are entirely harmless and non-toxica,•,*. APPLICATIONS OF ACETOGLYCERIDES IN COSMETICS The manner in which the novel properties of acetoglycerides are reflected in the final preparations can be illustrated best by considering their use in particular types of cosmetic formulations. (A) LIPSTICKS One of the most striking applications of acetoglycerides is in the formulation of lipsticks, in which field they have been enthusiastically adopted. They are not substitutes for materials which have been used in lipstick manufacture hitherto, but are of outstanding value by virtue of the unique properties which they impart.