HYGROSCOPIC AGENTS AND THEIR USE IN COSMETICS 19

20 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS obtained for the soap-type creams. The actual per cent weight losses for the creams containing no humectant were approximately the same as the soap-type creams at 30% and 70% R.H., however, at 50% R.H. the value for the soap-type cream was considerably lower than that ob- WE,G.T LOSS Or SOA. TY.E C.E^M ^T .......... GLYCERIN . • '-- • • --_ •"• •:•- ............. HOURS 24 HOURS 4E HOURS WEIOHT •055 OF NON-IONIC TYPE GRE• • $0% RELATIVE HUMIDITY I _ I x SORBITOL o GLYCERIN •#o•s • •o•s • •o• o o P_ 5 IO 15 20 o 2 5 IO 15 P_o Figure 10 0 2 5 I0 15 20 WEIGHT LOSS OF SOAP TYPE CREAM AT 50%. RELATIVE HUMIDITY SOR811'OL • - •. -- ......... GLYCERIN // '•-'" , ""'"'"• I0- _ -PROPYLENE GLYCOL f/ 5 WEIGHT LOSS OF NON-IONIC TYPE CREAM AT 50% RELATIVE HUMIDITY X SORBITOL o GLYCERIN I0 • ß PROPYLENE GLYCOL _ C 8 •OURS •4 •OURS 48 •OURS o • •, •o •5 •o 0 • • •0 •5 •0 0 z • •0 •5 •o Figure 11