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The objective of these experiments was to determine if the emollient material itself changes the pH of surfaces in contact with it. A laboratory experiment was conducted to determine how the pH of aqueous solutions kept in contact with the emollient is affected. The insides of four glass vials were completely coated with 2 g of melted emollient; then the vials were filled with 12.4 g of 0.9% saline solution and capped. After incubation at 37°C for 20 h, the pH of the saline solution in the vials was measured and compared to the pH of the same saline solution kept in 2 control vials with no emollient (Fig. 8).

Fig. 8. The vial on the left has the interior surface coated with emollient vs. the right vial with no emollient. Both vials contained 12.4 g saline solution. The pH of the control sample on the right is being measured.