The objective of this paper is to sensitometrically evaluate the effect of five sensitizing dyes (Acridine Orange, Pyronin E, Thionin, Erythrosin B, and Pinacyanol) on a photothermographic emulsion containing a 43-7-50 mole % ratio of mercurous oxalate, mercurous iodide, and silver iodide. The choice of dyes was based on their ability to sensitize into the longer wavelength region of the visible spectrum. Three concentrations of dye were used - 50, 100, & 200 micromoles per liter of emulsion. The sensitometric evaluation was based on the exposure of a neutral step wedge to tungsten light. The parameters investigated are those of relative speed, slope, maximum and minimum density, plus the effect of coating thickness on these factors.

Library of Congress Subject Headings

Photographic sensitometry; Photography--Processing

Publication Date


Document Type

Senior Project

Student Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Not listed.


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