Nearly all systems encountered in resinography are composed of several components, many of which have differentiating absorption spectra in the ultraviolet region of the spectrum. Ultraviolet microscopy provides the only direct means of studying the physical distribution of ultraviolet absorptive components in nonabsorptive or relatively low absorptive materials. Some chemical reactions can also be investigated with this instrumentation to obtain knowledge of the rates of formation or decomposition, diffusion characteristics, by-products formed, and so forth. This paper contains brief reviews of some problems that illustrate the unique and significant information concerning resinographic systems that can be obtained through the use of ultraviolet microscopical techniques.