392 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (b) is flexible at low temperatures and yet not too limp at normal temperatures (c) is impermeable to the product, including its perfume (d) welds easily (e) prints easily, giving a print with good adhesion (f) has a plasticiser which does not migrate into the product. It is, however, never possible to achieve all these properties and any P.V.C. used must be chosen by compromise, careful attention being paid as to which property or properties should be sacrificed in order to obtain a balance which will give the maximum possible storage life. ACKNOWLEDGMENT The author wishes to thank the Directors of County Laboratories, Ltd., for permission to publish this paper. REFERENCES B.I.O.S.'Report No. 1478, 16, London, 1948. Marriott, R. H., J. Soc. Cos. Chern., 3, 163 (1952). Wartman, L. H., Ind. Eng. Chern., 47, 1013 (1955). Becke, F., Sitzungber. Akad. Wiss. Wien., 102 (i) 358 (1893). Doty, P.M., Aiken, W. H. and Mark, H., Ind. Eng. Chem., 16,686 (1944). Brubaker, D. W. and Kammermeyer, K., Ind. Eng. Chern., 44, 1465 (1952). A METHOD FOR THE ANALYSIS OF LIPSTICK Presented at the May 18th, 1956, Meeting, New York City PAUL W. JEWEL, Ph.D.* THE ANALYSIS of lipstick presents the usual difficulties met with in cosmetic preparations in general. None of the raw materials used is a pure chemical individual, and one must face the prospect of separating a mixture of mixtures into its component parts. Then, after doing a]] that may be done to determine the nature and amount of the various mixtures present, one must undertake to reconstruct the original mixture from the results of such an analysis. The problem is made more difficult by the fact that the colours, bromos and lakes alike, tend to dissolve partially in the base, obscuring endpoints, and thus making any analytical procedure more than ordinarily difficult. * Max Factor & Co., Hollywood 28, Calif.

392 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (b) is flexible at low temperatures and yet not too limp at normal temperatures (c) is impermeable to the product, including its perfume (d) welds easily (e) prints easily, giving a print with good adhesion (f) has a plasticiser which does not migrate into the product. It is, however, never possible to achieve all these properties and any P.V.C. used must be chosen by compromise, careful attention being paid as to which property or properties should be sacrificed in order to obtain a balance which will give the maximum possible storage life. ACKNOWLEDGMENT The author wishes to thank the Directors of County Laboratories, Ltd., for permission to publish this paper. REFERENCES B.I.O.S.'Report No. 1478, 16, London, 1948. Marriott, R. H., J. Soc. Cos. Chern., 3, 163 (1952). Wartman, L. H., Ind. Eng. Chern., 47, 1013 (1955). Becke, F., Sitzungber. Akad. Wiss. Wien., 102 (i) 358 (1893). Doty, P.M., Aiken, W. H. and Mark, H., Ind. Eng. Chem., 16,686 (1944). Brubaker, D. W. and Kammermeyer, K., Ind. Eng. Chern., 44, 1465 (1952). A METHOD FOR THE ANALYSIS OF LIPSTICK Presented at the May 18th, 1956, Meeting, New York City PAUL W. JEWEL, Ph.D.* THE ANALYSIS of lipstick presents the usual difficulties met with in cosmetic preparations in general. None of the raw materials used is a pure chemical individual, and one must face the prospect of separating a mixture of mixtures into its component parts. Then, after doing a]] that may be done to determine the nature and amount of the various mixtures present, one must undertake to reconstruct the original mixture from the results of such an analysis. The problem is made more difficult by the fact that the colours, bromos and lakes alike, tend to dissolve partially in the base, obscuring endpoints, and thus making any analytical procedure more than ordinarily difficult. * Max Factor & Co., Hollywood 28, Calif.