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A series of mixtures comprising Imwitor 742 and Tween 80 have been prepared and their self-emulsifying properties studied using a method of visual examination. The particle size distributions of emulsions prepared from these mixtures at 25°C, 37°C in water and 37°C in 0.1 M HCl have been measured. A marked decrease in mean particle size was observed for 30 and 40% Imwitor 742/Tween 80 mixtures at...