Oriental Lacquers 3. Composition of the Urushiol Fraction of the Sap of Rhus verniciflua

The urushi fraction of several samples of the sap of Rhus verniciflua was analyzed by a combination of capillary gas chromatography,supercritical fluid chromatography,high resolution NMR spectroscopy and two techniques of mass spectrometry.The composition of the urushi fraction of these samples was found to consist in general of the components that had been found by formaer analyses of urushi samples.Some new understanding of the components recognized gives a more accurate recognition of the ingredients of oriental lacquers.