Investigation of the Relation Between the Adjacency Effects at an Edge Produced by Nitrogen-Burst and Viscous Processing

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Hooker, Richard
Film development; Process quality control; Rapid processing; Thesis
thesis / dissertation description
Adjacency effects in nitrogen-burst and viscous processing of Eastman Fine Grain Release Positive Film, Type 5302, (in well-buffered Phenidone-hydroquinone developers) were measured by edge exposure microdensitometer scans. A well-buffered basic formulation containing 10 grams of hydroquinone and 1 gram of Phenidone at a pH of 10.5 was chosen for study. Sensitivity to pH and concentration level was tested by independently reducing the developing-agent concentrations by 30 percent and 50 percent, and the pH to 10.2. Chemically equivalent formulations for viscous development were produced by thickening the developer solutions with sodium carboxymethyl cellulose. No significant adjacency effects were observed for nitrogen-burst processing. For viscous processing, significant adjacency effects occurred for all four formulations and were found within the limits of experimental error to be directly proportional to large-area edge density difference for constant high density at the edge used for this measurement. Adjacency effect magnitudes, expressed as a percentage of large-area edge density difference, were found to be 93 percent, 19.3 percent, and 31 2 percent for relative developing-agent concentrations of 1.0, 0.7, and 0.5, at a pH of 10.5, and 24.2 percent for a pH of 10.2 at a relative developing-agent concentration of 1.0.