The vapor-permeable adhesive film acts as the outermost skin layer during this experiment. However, this membrane is originally not designed for a hydration efficiency test...
Once we get a solidified base, we place the adhesive membrane on it, followed by the test product. All of our skin-hydrating products are oil-in-water emulsions. So, when we apply the test product, the adhesive film...
The membrane is now well-hydrated! But the question is how much and for how long? We find these answers through a corneometer. A corneometer is a device that tracks the hydration levels of the stratum corneum....