Several mechanisms have been proposed for the formation of filamentary silver in the development of silver halide grains, but none is satisfactory~([1]). Since filamentary silver is commonly obtained by developing silver halide emulsion in various developers for different time, the growth mechanism for developed silver filament remains one of the most perplexed questions that can't be evaded. The purpose of this article is to present some new observation and to provide some possible interpretations from a microscopic point of view.
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