Fine polymer particles having heterogeneous phase structure, silver photographic light sensitive material containing the fine polymer particles and image-forming method

A method for forming images on a silver halide monochromatic photographic light-sensitive material which comprises exposing, to light, a silver halide photographic light-sensitive material comprising, on the same surface of a substrate, at least one light-sensitive silver halide emulsion layer and at least one protective layer, and then developing the exposed light-sensitive material with a developer, wherein the silver halide emulsion layer and/or at least one of other hydrophilic colloidal layers comprise a latex polymer having active methylene groups and a core/shell heterogeneous phase structure;

• the developer comprises dihydroxybenzene and an auxiliary developing agent showing superadditivity;
• the pH increase observed when sodium hydroxide is added to the developer in an amount of 0.1 mole per liter of the developer is not more than 0.25;
• the initial pH value of the developer ranges from 9.5 to 11.0;
• and the amount of the developer supplemented is not more than 225 ml/m.sup.2.