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Abstract
Various experimental procedures used to obtain information on the mechanism of initiation of development are reviewed. These include microscopic examination, use of long wave radiation to follow the growth of optical density in unfixed grains, mathematical analysis of rate of development curves, initiation of development in an experimental developer followed by intensification in a standard developer, and examination of the dependence of the rate at various stages of development and conditions of exposure on the composition, temperature, and oxidation-reduction potential of the developer. The use of low temperature exposures to produce latent image centres of near threshold size and to obtain a controlled growth of latent image centres is discussed. Although not conclusive, the available evidence suggests that, if a change in basic mechanism occurs during the course of development in a low solvent type developer, it occurs much earlier than the start of filamentary growth of the developing silver.
Notes
Paper presented at a symposium on “Photographic Processing” organized by the Science Committee of the Royal Photographic Society, 21-24 September 1971 in Brighton.