{HEAD ~ Greater than 90 percent} of total projected area of the grains is accounted for by {TAIL ~ 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 
{ HEAD ~ Greater than 90 percent } of total projected area of the grains is accounted for by { TAIL ~ 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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