SORPTION-PURIFIED GELATINS IN SILVER-CHLORIDE PHOTOGRAPHIC-EMULSIONS

We study the effect of deeply sorption-purified gelatins on the crysta llographic characteristics and chemical ripening of silver chloride em ulsions containing cubic and tabular microcrystals. It is shown that d uring emulsion synthesis using purified gelatins, an increase in the a verage microcrystal size was observed, whereas in the case of tabular microcrystals, a fraction of the latter (S-t) was found to grow signif icantly. The rate of the chemical ripening reaction in the presence of purified gelatins but without chemical ripening agents slowed down, w hereas the use of these agents contributed to its noticeable increase. A relationship between the substances removed during sorption purific ation and the effects observed has been followed.