ratio of 97 3 solution whereby a planar silver iodobromide crystal grain emulsion was prepared the obtained planar silver halide grains have an average grain diameter of 1 18 u03bcm and a thickness of 0 11 u03bcm and their silver iodide content is 3 0 mole this emulsion was desalted by a precipitation method and then chemically sensitized by a gold sulfur sensitization method and after that spectrally sensitized by adding thereto a sensitizing dye sodium 3 5 chloro 2 2 5 chloro 3 3 sulfonate propyl benzoxazolino 2 indene methyl 1 butene 3 benzoxazolinopropane sulfonate in an amount of 150 mg per mole of silver halide and further as in the previous case 4 hydroxy 6 methyl 1 3 3a 7 tetrazaindene was added these grains were subjected to an optimum chemical sensitization in the same manner as previously mentioned and to this were added the same stabilizer additives and lime treated gelatin whereby an emulsion was prepared which was regarded as emulsion coating liquid 2 further to the coating liquid in addition to the hereinafter described additives were added the following compounds 1 and 2 in the following respective amounts per mole of silver halide str1 compound 1 in accordance with the method described in 3 of example 1 of japanese patent o p i publication no 285445 1986 was dissolved into an oil comprised of compound 2 then the solution was dispersed into a hydrophilic colloid solution and the dispersed liquid was added to the emulsion so that these compounds in the above amounts were contained in the emulsion coating liquid as for the protective layer a coating liquid having the hereinafter described composition was prepared in addition the coating was made so that the coating weight of silver halide.