Light-sensitive silver halide photographic material

Claim 2

A photographic material comprising a light-sensitive silver halide emulsion layer coated on a support which material contains a combination of a salt of tetrazolium containing only a non-metallic anion and a salt of tetrazolium containing a metallic anion, said metallic anion being a complex salt of an organic multivalent aminomultivalent carboxylic acid with a metal selected from the group consisting of iron, cobalt, nickel, copper, lead, chromium, titanium, cerium, samarium, europium and ytterbium, the valency of said metal ions being divalent for copper, trivalent for iron, cobalt, nickel, samarium, europium, chromium and ytterbium, and tetravlent for titanium, cerium, and lead in at least one of said silver halide emulsion layer or in a hydrophilic colloid layer adjacent to said silver halide emulsion layer.

Claim 3

A photographic material as claimed in claim 1 wherein the metallic anion is an iron (III), cobalt (III) or nickel (III) complex salt of an organic multivalent amino-multivalent carboxylic acid.

Claim 4

A photographic material as claimed in claim 1 wherein the salt of tetrazolium containing only a non-metallic anion is represented by the following Formula (I): [T n ⊕ ][X 1 .sup.⊖ ] n , in which T represents a tetrazolium cation, X 1 represents an anion containing only non-metalic atoms, and n is an integer of 1 or 2.

Claim 5

A photographic material as claimed in claim 1 wherein said salt of tetrazolium containing only a non-metallic anion and said salt of tetrazolium containing a metallic anion are in the silver halide emulsion layer.

Claim 6

A photographic material as claimed in claim 1 or 4 wherein said salt of tetrazolium containing only a non-metallic anion and said salt of tetrazolium containing a metallic anion are each in an amount of 10 -5 -10 mol per 1 mol silver halide.

Claim 7

A photographic material as claimed in claim 3 wherein T consisting in Formula (I) represents triphenyltetrazolium and X 1 represents an alkylsuccinic acid ester sulfonate.

Claim 8

A photographic material as claimed in claim 2 wherein the metallic anion is an iron (III) complex salt of an organic multivalent amino-multivalent carboxylic acid.

Claim 9

A process for developing a photographic material comprising a light-sensitive silver halide emulsion layer coated on a support which material contains a combination of a salt of tetrazolium containing only a non-metallic anion and a salt of tetrazolium containing a metallic anion, said metallic anion being a complex salt of an organic multivalent aminomultivalent carboxylic acid with a metal selected from the group consisting of iron, cobalt, nickel, copper, lead, chromium, titanium, cerium, samarium, europium and ytterbium, the valency of said metal ions being divalent for copper, trivalent for iron, cobalt, nickel, samarium, europium, chromium and ytterbium, and tetravalent for titanium, cerium, and lead in at least one of said silver halide emulsion layer or in a hydrophilic colloid layer adjacent to said silver halide emulsion layer; said process comprising image-wise exposing said photographic material and then developing said photographic material with a developer containing from 5 to 300 g/liter of a sulfite.

Claim 10

A process for developing a photographic material comprising a light-sensitive silver halide emulsion layer coated on a support which material contains a combination of a salt of tetrazolium containing only a non-metallic anion and a salt of tetrazolium containing a metallic anion, said metallic anion being a complex salt of an organic multivalent aminomultivalent carboxylic acid with a metal selected from the group consisting of iron, cobalt, nickel, copper, lead, chromium, titanium, cerium, samarium, europium and ytterbium, the valency of said metal ions being divalent for copper, trivalent for iron, cobalt, nickel, samarium, europium, chromium and ytterbium, and tetravalent for titanium, cerium, and lead in at least one of said silver halide emulsion layer or in a hydrophilic colloid layer adjacent to said silver halide emulsion layer; said process comprising image-wise exposing said photographic material and then developing said photographic material with a developer containing from 5 to 300 g/liter of a sulfite.

Claim 11

The process of claim 8 wherein said photographic material is developed with a developing solution containing p-methylaminophenol sulfate or 1-phenyl-3-pyrazolidone-hydroquinone or mixtures thereof.

Claim 12

The process of claim 8 or 9 wherein said developer also contains from 5 to 300 g/liter of a carbonate.