(Received 2 March 1979; accepted 20 June 1979)
Published Online: January
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A method is presented for the characterization of zinc oxide photocopy papers. The tests include nondestructive physical examinations of weight, pH, and color under ultraviolet light. Chemical tests, consisting of thin-layer chromatographic examination of the sensitizing dyes and infrared spectrophotometry of the binder resins, are carried out on extractions of the photoconductive surface layer. A semiqualitative flow chart has been prepared that permits differentiation of most of the zinc oxide photocopy papers on the basis of the composite of characteristics of 50 papers supplied by eleven manufacturers.
Chief document examiner, Wisconsin Crime Laboratory Bureau, Madison,
Postgraduate student, University of Wisconsin, Platteville,
Stock #: JFS10946J