10 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS and 85% relative humidities. These data are presented in Table 1. In addition, Table 1 lists available physical data on these humectant compounds including viscosity and specific gravity .rs. temperature and concentration, vapor pressure rs. temperature, boiling point, freezing point rs. concentration, water solu- bility, and other information. A graphical method of choosing humectants for a desired equilib- rium hygroscopicity and for cal- culating the effect of combinations • 10 3 3o 4O 5o •0 70 Relatlv• •u•d•ty-• Figure 2.--Humectants Estimation of Equilibrium Moisture Contents from 500)• R. H. Value

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