Greater than 90 percent of {HEAD ~ total projected area} of {TAIL ~ the grains} is accounted for by tabular grains having major faces, exhibiting a thickness of less than 0.07 μm, and having latent image forming silver salt epitaxy chemical sensitization sites on their surfaces, and a dispersing medium that contains a grain dispersity reducing concentration of a polyalkylene oxide block copolymer surfactant comprised of two terminal lipophilic alkylene oxide block units linked by a hydrophilic alkylene oxide block unit accounting for from 4 to 96 percent of the molecular weight of the polymer 
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Greater than 90 percent of { HEAD ~ total projected area } of { TAIL ~ the grains } is accounted for by tabular grains having major faces , exhibiting a thickness of less than 0.07 μm , and having latent image forming silver salt epitaxy chemical sensitization sites on their surfaces , and a dispersing medium that contains a grain dispersity reducing concentration of a polyalkylene oxide block copolymer surfactant comprised of two terminal lipophilic alkylene oxide block units linked by a hydrophilic alkylene oxide block unit accounting for from 4 to 96 percent of the molecular weight of the polymer
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