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Pseudo-ternary phase diagrams of formulations composed of Capryol™ 90 (oil), Labrasol® (surfactant) and propylene glycol (cosurfactant) dispersed in distilled water. The surfactant mixtures (Smix) used consisted of surfactant and cosurfactant at three different ratios of (A) 1:1, (B) 2:1, and (C) 3:1. The gray area indicates that the formulations formed oil-in-water microemulsions.
