A simple analysis of the changes during evaporation of a commercial emulsion of unknown composition.

Abstract

Opticalm icroscopayn d centrifugationw ereu sedt o observeth e structuracl hangeds uringe vaporatioonf a commercials kin lotion of unknown compositionT. he degreeo f evaporationw as determinedf rom the changedw eight of a microscopsel ide with the emulsiono n a defineda reaa nd thicknesst,h e evaporation lossv ersust ime being measuredb y a balanceu nder an infraredl amp. The resultsr evealedn ot only whichp artso f the emulsionw erem ostp ronet o evaporationw ithout chemical analysisb, ut alsog aves urprisingin formationa s to whichk ind of structuresw ould appeara fter extensive evaporationT.h e importancoe f thesec hangefso r the actiono f a skin lotioni s brieflyd iscussed.