It has been discovered quite unexpectedly that epitaxially sensitized ultrathin tabular grain emulsions having a coefficient of {TAIL ~ variation} of mean grain size of less than 30 percent prepared in the presence of a selected class of polyalkylene oxide block copolymers exhibit lower levels of minimum density than have been realized heretofore for emulsions of comparable grain dimensions and {HEAD ~ dispersity} 
It has been discovered quite unexpectedly that epitaxially sensitized ultrathin tabular grain emulsions having a coefficient of { TAIL ~ variation } of mean grain size of less than 30 percent prepared in the presence of a selected class of polyalkylene oxide block copolymers exhibit lower levels of minimum density than have been realized heretofore for emulsions of comparable grain dimensions and { HEAD ~ dispersity }
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