286 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 1. Illustration of the comfortable posture allowed for volunteer subjects during the rapid, noninva- sive, analysis of their skin using a horizontal mount for multiple-attenuated-internal-reflection prisms. A similarly comfortable pose allows contact angle measurements on living skin which reveals the true outer- most skin chemistry, before and after cosmetic application

CHARACTERIZATION OF HUMAN SKIN CHEMISTRY 287 Figure 2. Schematic drawings of (top) the position of the horizontal prism mount protruding slightly from the sample space of a recording spectrophotometer, (center) of the forearm of a test subject in place for spectral analysis and (bottom) a close-up view of the residue usually left on the prism face for further analysis after the in situ skin chemistry has been ascertained

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