Two sets of Super XX cut film strips were hypersensitized under varying conditions of hypersensitizing agent used, concentration of hypersensitizing solution and time of hypersensitizing. The strips were rapidly dried and exposed. One set was exposed with a high film plane illuminance for 5.0 seconds, and the second set was exposed with a low film plane illuminance for 10^4 seconds. The difference in exposure necessary to give a density of 1.50 for the strips of each set was used as a measure of the reciprocity law failure. From the H and D curves of each test a measure of the fog level and gamma of the material was also measured. A statistical analysis of the data showed that the low intensity failure of the receprocity law was reduced after hypersensitization and that this reduction was accomplished with no change in gamma and with a slight increase in the fog level under the optimum conditions.
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Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
West, Charles, "Hypersensitization and Reciprocity Law Failure" (1962). Thesis. Rochester Institute of Technology. Accessed from
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