This thesis has two objectives. One is to see if in reversal films solarization has begun before reaching the maximum density in the negative image. Acetone semicarbazone was added to the emulsions, so that if solarization were significant, this halogen acceptor, by elimination of the solarization, would increase the maximum density. The films tested were KODAK PLUS-X Reversal Film Type 7276, TRI-X Reversal Film Type 7278, Fine Grain Release Positive Type 5302, and PANATOMIC-X. It is concluded that solarization does not have a significant effect on the maximum density, slope near the maximum density, or density scale of the negative D Log E curve. The second objective is a study to see what happens to the development rate and the sensitivity of the residual silver-halide emulsion after first exposure, first development, and bleaching as a function of the first exposure. The sensitivity is expected to drop quite dramatically with increasing first exposure and the results show it does. For the one film tested, PLUS-X Reversal, it was found that the development rate, corrected for change in Dmax, materially decreased with increasing first exposure. There was a decrease in development rate resulting from bleaching the first image with destruction of chemical sensitization; the effect of exposure was superimposed on this. The bleached film showed a large, unexplained increase in fog on second development.

Library of Congress Subject Headings

Photography--Developing and developers

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Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Carroll, Burt


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