The simple measuring method of water evaporation rate from the skin using anhydrous cobalt chloride paper

In considering the effectiveness of cosmetics, the moisturizing effect on the skin is most important. This consists of two components, one being the occlusivity which supress water evaportion, and the other is water holding capacity. The new method for measuring the water evaporation rate has been developed by us. This method is made up by anhydrous cobalt chloride paper and high-speed spectrophotometer, Anhydrous cobalt chloride changes color from blue to pink when it absorbs water. The change in the reflectance was measured with a high-speed spectrophotometer. The detail of this method and examples measured were reported.