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US 4,232,118 AGranted
Light-sensitive silver halide photographic material
AssigneeKonishiroku Photo Industry Co., Ltd.
InventorsKen Okauchi, Takeo Koitabashi, Noboru Fujimori
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Abstract
A photographic material having a light-sensitive silver halide emulsion layer containing a mixture of monomethinecyanine dyes is disclosed. The mixture is particularly suitable for minimizing fog in the finished product.
Claims7
A photographic material having a light sensitive silver halide emulsion layer coated on a support which contains a compound of the following general formula I and a compound of the following general formula II:
- ##STR5## wherein Z.sub.1 represents a group of non-metal atoms required to complete a 5 membered heterocyclic residue containing an oxygen atom;
- Z.sub.2 represents a group of non-metal atoms required to complete a 5 membered heterocyclic residue containing an oxygen, sulfur or selenium atom;
- R.sub.1 and R.sub.2 each represent aliphatic groups, at least one of them containing a sulfo or carboxyl group;
- X.sub.1.sup..crclbar. represents an acid anion and n.sub.1 represents a number of 0 or 1, said n.sub.1 being 0 when an intramolecular salt is formed;
- ##STR6## wherein Z.sub.3 and Z.sub.4 each represent groups of non-metal atom required for forming a thiazole, benzothiazole, naphthothiazole, selenazole, benzoselenazole, naphthoselenazole nucleus, R.sub.3 and R.sub.4 each represent aliphatic groups, at least one of them containing a sulfo or carboxyl group, R.sub.2.sup..crclbar. represents an anion and n.sub.2 represents a number of 0 or 1, said n.sub.2 being 0 when an intramolecular salt is formed.
2 more elements
Dependencies are inferred from the claim text.