Silver halide emulsion, preparation method of silver halide emulsion, silver halide light-sensitive photographic material, silver halide light-sensitive color photographic material, and image forming method

An preparation method of a silver halide emulsion containing silver chlorobromide grains or silver chloroiodobromide grains, each of the silver halide grain having a silver chloride content of not less than 98%, the preparation method comprising the steps in the following order of:

• a host grain emulsion preparation step to prepare a host grain emulsion;
• a first bromide addition step to add a bromide compound to the host grain emulsion;
• a chemical sensitization step to subjecting a chemical sensitization to the host grain emulsion for at least 60 minutes after the first bromide addition step;
• and
• a second bromide addition step to add a bromide compound to the host grain emulsion after the chemical sensitization step.

A preparation method of a silver halide emulsion comprising silver halide grains, each of the silver halide grains having a silver chloride content of not less than 90%, the method comprising the steps in the following order of:

• preparing a host grain emulsion;
• adding a chemical sensitizer to the host grain emulsion;
• adding a Compound B having polychalcogen structure represented by the following General Formula (I);
• and
• adding a Mercapto Compound C,
• —(X)m—(Y)n— General Formula (I)
• wherein each of X and Y represents an atom selected from sulfur, selenium and tellurium;
• each of m and n represents an integer not less than 1.