The sensitometric effects of varying developing agent concentration, fixing agent concentration, and pH in a monobath developer were studied with Kodak Tri-X Pan film. Three variables (gamma, base plus fog, and a shoulder density) were studied under varying levels of each of the factors. A factorial experiment was run and an analysis of variance (ANOVA) was used to determine whether or not each of the main factors and the two-factor interactions were significant. The higher order interactions were used as a measure of experimental error for the analysis. In the range of the factors being investigated, it was found that: 1. gamma decreases linearly with geometrically increasing fixing agent concentration; 2. gamma decreases linearly with increasing pH; 3. studying gamma, both the developing agent concentration-fixing agent concentration interaction and the fixing agent concentration-pH interaction are significant; 4. base plus fog increases linearly with increasing pH; 5. shoulder density increases linearly with geometrically increasing developing agent concentration; 6. shoulder density decreases linearly with geometrically increasing fixing agent concentration; 7. shoulder density decreases linearly with increasing pH; and 8. studying shoulder density, the fixing agent concentration-pH interaction is significant.
Library of Congress Subject Headings
Photography--Developing and developers
Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
McSweeney, Gary, "Spatial interactions in monobath development" (1970). Thesis. Rochester Institute of Technology. Accessed from
RIT – Main Campus