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A wide variety of natural resins, waxes, gums, drying oils and proteinaceous materials used on paintings are photoluminescent. The photoluminescence spectra of these materials are reported and discussed. The application of this technique towards the identification of these materials is considered. Both bulk materials and films prepared from selected bulk materials were studied and a comparison is made between the bulk and film samples. Temperature and excitation wavelength studies are reported and discussed for several of the samples.

INTRODUCTIQNThe purpose of this paper is to show the connections between resonance Raman and electronic emission and absorption spectra. The time -dependent theory of Heller is used throughout this paper because both the physical interpretation and the mathematical calculations emphasize the connections.1-4 First, the time-dependent theory of electronic spectroscopy is introduced. Next, the timedependent theory of resonance Raman spectroscopy is discussed and the intensities of fundamentals are examined. The theory is then applied to the spectra of Rh2(O2CCH3)4(PPh3)2 and W(CO)5(Pyridine).