MEASUREMENT OF ODORS IN COSMETICS 13 odor threshold number of perfumes, colognes, lotions, and all kinds of perfumed cosmetics. It is the sur- est way of comparing successive batches, not only as soon as manu- factured, but also after storage or shelf life for any length of time. It is a great help in the comparative use of various natural and synthetic fixatives and in the study of porous packaging materials. ODOR MEASUREMENTS (ODOR T•RESI•OLD NUMBERS) Treated As Samples is Acetate rayon 0 Jersey tricot 0 Rayon hose 0 After washing:. 5 10 15 20 25 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Untreated Control Samples Acetate rayon ............ 19.7 Jersey tricot .............. 20.2 Rayon hose ............... 21.7 30 35 times 0 0 0 0 0 0 0 0 0 Sample Acetate rayon q- 10 cc. con- taminated perspiration Control: untreated filter paper q- 10 cc. contami- nated perspiration Odor Threshold Number 6.5 17.3 Odor Threshold Sample Number I ..................... 18.2 II ..................... 0 III ..................... 0 DEODORIZING ACTION OF ODORLESS UNDERARM DEODORANTS 1 Minute 5 Minutes O. T. N. perspiration 18.2 18.2 With sample A 10.5 6.5 With sample B 0 0 With sample C 7.2 3.2 With sample D 3.1 0 With sample E 6.8 2.5 MODIFICATIONS IN INTENSITY AND NATURE OF ODORS DURING STORAGE After 3 After 6 After 1 Sample As Manufactured Months Months Year Cologne A O.T.N. 67.5 65.8 Nature of odor: Perfume Perfume Cologne B O.T.N. 58.2 54.2 Nature of odor: Perfume Perfume Cologne C O.T.N. 61.4 57.6 Nature of odor: Perfume Perfume Cologne D O.T.N. 48.7 40.6 Nature of odor: Perfume 20% Perfume 80% Musk 63.2 59.2 Perfume Perfume 49.3 30.1 Perfume Perfume 42.0 28.7 70% Perfume Musk 30% Musk 38.2 34.7 Musk Musk

14 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS MODIFICATIONS IN INTENSITY AND NATURE OF ODORS DURISri3 STORAGE After 3 After 6 Sample As Manufactured Months Months Powder A O.T.N. 38.7 33.2 •8.1 Nature of odor: Perfume 90O-/o Perfume 90O-/o Perfume 10% Musk 10% Musk 30.9 24.1 50% Perfume Musk 50% Musk 40.1 20.8 Perfume 60% Mercaptan 40% Musk Powder B O.T.N. 36.4 Nature of odor: Perfume Powder C Nature of odor: O. T. N. 18.2 Mercaptan Liquid SOA•,S Samples Odor Threshold Numbers . As After Re- 6 ceived Months Glycerin No. 275 16.7 16.1 Synthetic D27 21.2 20.1 "Odorless" No. 3 6.7 6.4 Dentist type No. Z64 18.9 17.1 Beauty parlor shampoo FL 27.6 20.1 Expensive shampoo BD 26.1 25.7 MODIFICATIONS IN INTENSITY OF ODOR OF THE SAME PRODUCT IN VARIOUS PACKAGING MATERIALS Sample After 3 After 6 Face Powder in: As Manufactured Months Months Container A O.T.N. 38.7 32.5 24.2 Container B O.T.N. 38.7 35.6 28.1 Container C O.T.N. 38.7 20.2 6.2 Container D O.T.N. 38.7 28.7 18.6 Container E O.T.N. 38.7 26.1 9.3 LEGEND Odor Threshold Number Quality of Odor 6.0- 8.3 Slight 8.4-13.0 Moderate 13.1-26.0 Strong (objectionable) 26.0-91.0 Extremely strong