Abstract
AbstractIt has been observed that an exposed sample of emulsion containing tabular silver bromide grains yields the usual tangled masses of filamentary silver on development in an active developer, but that on simple dilution of the developer, or decrease in the concentration of developing agents, there is some tendency to form individual thick filaments of silver. The filamentary masses appear to be initiated from sites on or near grain edges, whereas the individual filaments grow out of the large (111) faces.It is suggested that the initial growth processes are the same at the two sites, but that halide adjacent to a development centre on an edge passes into solution more readily than halide adjacent to a centre on a face. This will lead to an increase in relative rate of development from an edge as new centres are formed by uncatalyzed reduction on silver halide surface where colloid protection has been decreased, and continued development of face centres will be inhibited by competition. However, init...
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