It has been discovered quite unexpectedly that epitaxially sensitized ultrathin tabular grain emulsions having a coefficient of variation of {HEAD ~ mean grain size} of {TAIL ~ 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 dispersity 
It has been discovered quite unexpectedly that epitaxially sensitized ultrathin tabular grain emulsions having a coefficient of variation of { HEAD ~ mean grain size } of { TAIL ~ 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 dispersity
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