Abstract: Monodisperse, negative working photosensitive silver halide emulsions comprising grains having a uniform habit and relatively high degree of crystal disorder are prepared by precipitating silver halide in the presence of a seed emulsion which is predominantly silver chloride under conditions whereby substantially none of the silver chloride of said seed emulsion is redissolved and substantially no additional grains are formed.

Abstract: Photosensitive silver halide emulsions are provided with enhanced stability by the following sequence of steps:(a) providing sufficient stabilizer to the emulsion to stop chemical ripening but insufficient to interfere with spectral sensitization;(b) spectrally sensitizing said emulsion; and(c) adding to said emulsion a water soluble bromide salt, 1-phenyl-5-mercaptotetrazole; and a stabilizer selected from the group consisting of an hydroxy triazaindene, an amino triazaindene, an hydroxy tetrazaindene, an amino tetrazaindene, an hydroxy pentazaindene and an amino pentazaindene.

Abstract: Photosensitive silver halide emulsions are prepared by alternating precipitation of silver halide and the addition of a water-soluble iodide salt which replaces a portion of the less soluble halide.