Abstract: A silver halide light-sensitive photographic material comprises a support and a Lippmann emulsion layer on the support containing a silver halide and at least one compound of the following formula in a quantity of at least 3.5.times.10.sup.-3 mole per mole of the silver halide of the Lippmann emulsion layer: ##STR1## wherein Z represents an atomic group necessary to form a heterocyclic ring; Y is a hydrogen atom or --S--R.sub.1 group; R and R.sub.1 are each a hydrogen atom, an alkali-metal atom, ammonium or an alkyl group; X and X.sub.1 are each a divalent organic group; m and m.sub.1 are each 0 or 1; and n is an integer of up to 3, provided if n is 0, Y is --S--R.sub.1 group.The silver halide light-sensitive photographic material is developed in a developer containing at least 0.6 mole per liter of sulfurous ions.

Abstract: A process for preparing silver halide emulsions having high sensitivity and contrast by adding water-soluble iridium compounds during precipitation or physical ripening and adding water-soluble iodide compounds and sulfer sensitizers during chemical ripening.