Abstract
It has been observed that gelatin shells from tabular grains of silver bromide emulsions which have been sulphur sensitized may contain particles having linear dimensions of 3 to 6 nm. It is believed that silver sulphide is an important constituent of these particles since the quantities of such material in shells of different emulsions are related qualitatively to their sensitizer additions, and X-ray microanalysis of individual shells has revealed the presence of sulphur.From observations on the distribution of particles at moderate and high sensitizer additions it would appear that the sensitizing reaction occurs to a similar extent at a large number of sites which are uniformly distributed over the grain surface and are quite possibly kink sites.
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