2006 Volume 69 Issue 5 Pages 340-346
Hitherto, photographic emulsion grains have been prepared by introducing the aqueous silver ion solution and the aqueous halide solution into the gelatin protective colloid solution under the vigorous mixing. In case of mono-halide crystal such as silver bromide or silver chloride, no crystal imperfection was generatedin them, but in case of mixed crystals such as silver iodo-bromide or silver bromo-chloride, twin dislocations and edge dislocations were generated in the graingrowth period. These imperfections didn't ever appear when silver halide grains were grown by Ostwald ripening process in which silver ions and halide ions wereadded by ultra fine grains instead of aqueous solutions. Control of imperfections in mixed crystals make it possible to know about their nature and effects uponphotographic properties.
