Abstract
Permanent image formation in silver halide photography is realized via a number of unit processes, each of which involves mass transport and chemical reaction steps in thin polymer (gelatin) layers. A modified rotating ring-disc technique (MRRDE) is used here to determine the mechanism and the rate of one basic process: the fixation of a photographic emulsion. For quantitative analyses, a general, numerical approach for the electrode processes is presented. An implicit finite difference formalism is developed, as it is accepted [1] to be an efficient strategy in the numerical solution of mass flow equations containing strongly non-linear terms, owing to the presence of chemical reactions. The high reliability and accuracy of the strategy are demonstrated with representative experiments for the fixation of an AgCl emulsion in thiosulphate solutions.
Published Version
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