Silver halide emulsion and silver halide color photographic light-sensitive material

A silver halide color photographic light-sensitive material comprising a blue-sensitive emulsion layer, a green-sensitive emulsion layer, and a red-sensitive emulsion layer, on a support, wherein at least one of these color-sensitive emulsion layers comprises a color-sensitive layer unit that is composed of at least two light-sensitive layers each having different sensitivity;

• and wherein a layer having the lowest sensitivity of the color-sensitive layer unit, contains a silver halide emulsion comprising at least a dispersion medium and silver halide grains, in which 60% or more of the total projected area of the said silver halide grains is occupied by tabular grains having an epitaxial junction, which grains each have a {100} face as a main plane and an aspect ratio (diameter/thickness ratio) of from 2.0 to 100, and in which a right-angled parallelogram enclosed with {100} side faces at the main plane edges on the portion of the tabular grains, which portion does not have the epitaxial junction, or if the tabular grains have at least one corner broken off, a right-angled parallelogram formed by extending the {100} side faces at the main plane edges, has a slenderness side ratio (a ratio of the length of the long side to that of the short side) of 1 to 6, and in which the tabular grains have the epitaxial junction with a silver halide protrusion that has a higher solubility than the portion of the tabular grains, which portion does not have the epitaxial junction;
• and wherein a layer having the highest sensitivity of the color-sensitive layer unit, contains an emulsion comprising light-sensitive silver halide tabular grains having a {111} face as a main plane and as aspect ratio of not less than 2, and wherein the silver halide grains have an AgCl content of 0 to 50 mol %.

A silver halide color photographic light-sensitive material comprising a blue-sensitive emulsion layer, a green-sensitive emulsion layer, and a red-sensitive emulsion layer, on a support, wherein at least one of these color-sensitive emulsion layers comprises a color-sensitive layer unit that is composed of at least two light-sensitive layers each having different sensitivity;

• and wherein a layer having the lowest sensitivity of the color-sensitive layer unit, contains a silver halide emulsion comprising at least a dispersion medium and silver halide grains, in which 60% or more of the total projected area of the said silver halide grains is occupied by tabular grains having crystal defects for anisotropic growth, which grains each have a {100} face as a main plane and an aspect ratio (diameter/thickness ratio) of not less than 2.0, and in which a right-angled parallelogram enclosed with {100} side faces at the main plane edges of the tabular grains, or if the tabular grains have at least one corner broken off, a right-angled parallelogram formed by extending the {100} side faces at the main plane edges, has a slenderness side ratio (a ratio of the length of the long side to that of the short side) of 1 to 6, and in which a six-coordinate dopant capable of forming a shallow electron trap is present in a crystal lattice;
• and wherein a layer having the highest sensitivity of the color-sensitive layer unit, contains an emulsion comprising light-sensitive silver halide tabular grains having a {111} face as a main plane and an aspect ratio of not less than 2.