Several fundamental questions are discussed relating to show through of ink on paper. These questions relate to (a) the significance of ink and press variables in regard to show through; (bj the correlation between the light reflectivity of an ink film thickness and the show through of the ink; (c) the correlation between the percentage of pigment in the ink, and the show through of ink; (d) the interchangeability of various instruments for the measurement of show through. Data is obtained using a standard offset ink in combination with several different kinds of paper. Several, different known ink film thicknesses are tested as well as various pigment concentrations. Samples are tested on the IGT printability tester. Using an opacimeter, a reflection densitometer, and a spectrophotometer, the show through for each printed sample is determined In terms of the opacity of the paper used, the reflection density of the ink film, and the reflective spectrum of the ink film. Correlation between the variables in the research is established. The resulting data is analysed using various statistical techniques. It is concluded from the resulting data and analysis that there are several variables that will contribute to show through. A change in pigment concentration or ink film thickness will result in a change in the show through of a particular ink on a particular paper. There is a correlation between the weight and type of paper and the show through of ink on those papers. Some instruments are adequate for determining show through, while others are not. It is recommended that reflection density of an ink film be used as a simple indication of show through. Problems regarding accuracy of instrumentation are discussed.
Library of Congress Subject Headings
Printing; Paper--Printing properties; Printing ink
Department, Program, or Center
School of Media Sciences (CIAS)
Nourse, William, "The Influence of Press Variables and the Measurement of Show Through of Paper" (1976). Thesis. Rochester Institute of Technology. Accessed from
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