Abstract
By use of sensitometric and processing techniques it is shown that for typical commercial emulsions the grains which do not form surface image readily are the more sensitive ones for internal-image formation. From residual grain size data it is shown that this relationship between surface and internal sensitivities exists within individual size classes. Arguments are presented in favour of the view that the reciprocal relationship between surface and internal sensitivity is due in part to inherent differences among grains. The observations emphasize that the surface/internal sensitivity ratio for grains of high surface sensitivity can exceed considerably the corresponding ratio for the emulsion layer as a whole for production of small or moderate densities.
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