A Novel Quality Control Method for the Determination of the Refractive Index of Oil-in-Water Creams and Its Correlation with Skin Hydration

The sensory properties of cosmetic products can influence consumers’ choice. accurate correlation properties, such as skin hydration, with the material formulation could be desirable. In this study, we aimed to demonstrate a new method for in vitro measurement refractive indices (RIs) turbid creams. critical wavelength each cream was obtained through direct using sun protection factor (SPF) meter; value then applied Sellmeier equation determine RI. results from hydration correlated their RI values. This suggests that measurements useful predictive tool ranking creams terms effects.