Negative type silver halide photographic material comprising silver halide grains of core-shell structure

A negative type silver halide photographic material comprising silver halide grains of a core-shell structure comprising:

• (1) an inner core consisting essentially of silver bromide or silver iodobromide, the silver iodide content of said inner core being within the range of 0 to 40 mole %, and
• (2) a plurality of shells consisting essentially of silver bromide or silver iodobromide, the shells of each silver halide grain comprising:
• (a) an outermost shell containing 0 to 10 mole % silver iodide,
• (b) a highly iodide-containing shell provided inside said outermost shell and having a silver iodide content within the range of 8 to 40 mole % and at least 8 mole % higher than that of said outermost shell, and
• (c) an intermediate shell provided between the outermost shell and the highly iodide-containing shell, the silver iodide content of said intermediate shell being at least 3 mole % higher than that of said outermost shell, and at least 3 mole % lower than that of said highly iodide-containing shell,
• the whole content of silver iodide in each silver halide grain being within the range of 2 to less than 12 mole %.