Abstract
AbstractThe sensitization and latent fogging of a photoemulsion with several sulphur sensitizers was followed. The kinetic law of sulphur sensitization observed was 1/t =cQm where t is digestion time, Q is sensitizer quantity, and c and m are constants depending on the sensitizer used and the emulsion conditions. These results, in conjunction with the known kinetics of sulphide formation are not consistent, with a single reaction step to give a sulphide sensitivity speck. A two-step reaction where the second step is not first order may be involved, and this may be the production of adsorbed sulphide atoms followed by their rearrangement into specks. A convenient experimental technique is described for following the photographic sensitometric properties of a digesting silver halide photoemulsion by taking a large number of Samples.
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