It has been discovered quite unexpectedly that epitaxially sensitized ultrathin tabular grain emulsions having a coefficient of 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 {HEAD ~ emulsions} of {TAIL ~ comparable grain dimensions} and dispersity 
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It has been discovered quite unexpectedly that epitaxially sensitized ultrathin tabular grain emulsions having a coefficient of 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 { HEAD ~ emulsions } of { TAIL ~ comparable grain dimensions } and dispersity
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