METHODS FOR THE STUDY OF THE KINETICS OF THE CHEMISTRY OF PHOTOGRAPHIC PROCESSES .1. SIMULATION OF THE PHOTOGRAPHIC BLEACH PROCESS AT A ROTATED SILVER DISC

The photographic bleach process was simulated with a rotated silver di sc by dipping the disc for a given time into a bleach bath. The silver halide formed during the bleaching could accurately be determined by electrochemical reduction. The bleach rate was obtained by varying the bleach time using several experiments. Thus, one could study the infl uence of several parameters on the kinetics of bleaching. The paramete rs include the composition as well as the concentration of the bleach bath, the pH, and the temperature. Furthermore, both the mixed potenti al and the mixed current could be determined experimentally. The bleac h process was quantitatively described by recording the current-potent ial curves of the redox partner; taking the silver disc as electrode.