Twinning and Growth of Silver Bromide Microcrystals

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Abstract
Almost without exception, the shapes of the microcrystals of a negative-type silver bromide photographic emulsion can be explained on the basis of a simple mechanism of twin-accelerated layered growth. Multiple twinning, both on parallel and nonparallel [111] crystallographic planes, is required for a full explanation, and evidence that this does occur is found. The location of particles of silver, formed by exposure to light, substantiates this hypothesis, and demonstrates the fact that intersections of the twin planes with the grain surface are preferential regions for the location of photolytic silver.