| 摘要 |
Disclosed is a photographic silver halide emulsion comprising a tabular silver halide grain having at least two twin crystal planes; and at least one of a unsymmetrical cyanine represented by Formula I, and at least one of a symmetrical cyanine represented by Formula II-(a), and at least one of a symmetrical cyanine represented by Formula II-(b); <CHEM> <CHEM> wherein Z1 and Z2 each represents a group of atoms necessary to form a naphthoxazole ring, a naphthoimidazole ring, a naphthoselenazole ring, a benzoxazole ring, a benzothiazole ring, a benzimidazole ring, a benzselenazole ring, Z1 and Z2 are not the same with each other, a heterocyclic ring formed by Z1, Z2 may have a substituent; R1, R2, R3, R4, R5 and R6 each represents an unsubstituted alkyl group or a substituted alkyl group; m represents an integer of 0 to 2, L1 to L9 each represents a methine group or a substituted group; X1, X2 and X3 each represent a charge-balancing counter ion; n1, n2 and n3 each represent an integer larger than 0 and necessary to neutralize the change of the whole molecule. A photographic silver halide emulsion according to this invention is improved both in spectral sensitivity and storage stability.
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