Color radiography

Claim 3

IMAGE-WISE EXPOSING TO DIRECTLY OR INDIRECTLY RECORDABLE PENETRATING RADIATION A PHOTOGRAPHIC MATERIAL COMPRISING AT LEAST ONE SILVER HALIDE EMULSION LAYER CONTAINING SILVER CHLORIDE IN AN AMOUNT CORRESPONDING WITH 5 TO 16G OF SILVER NITRATE PER SQ. M AND A COLORLESS COLOR COUPLER WHICH FORMS AN AZOMETHINE- OR QUINONIMINE DYESTUFF BY COUPLING WITH AN OXIDIZED P-PHYLENE DIAMINE TYPE DEVELOPING AGENT AND A COLORLESS HYDRAZONE COMPOUND HAVING THE FORMULA

Claim 4

IMAGE-WISE EXPOSING TO DIRECTLY OR INDIRECTLY RECORDABLE PENETRATING RADIATION A PHOTOGRAPHIC MATERIAL COMPRISING AT LEAST ONE SILVER HALIDE EMULSION LAYER CONTAINING SILVER CHLORIDE IN AN AMOUNT CORRESPONDING WITH 5 TO 16G OF SILVER NITRATE PER SQ. M AND A COLORLESS COLOR COUPLER WHICH FORMS AN AZOMETHINE- OR QUINONIMINE DYESTUFF BY COUPLING WITH AN OXIDIZED P-PHYLENE DIAMINE TYPE DEVELOPING AGENT AND A COLORLESS HYDRAZONE COMPOUND HAVING THE FORMULA

Claim 5

COLOR DEVELOPING THE EXPOSED SILVER HALIDE WITH A P-PHENYLENE DIAMINE TYPE DEVELOPING AGENT TO PRODUCE IN THE EXPOSED AREAS OF SAID EMULSION LAYER AN IMAGE OF SAID AZOMETHINE OR QUINONIMINE DYESTUFF, AND

Claim 6

COLOR DEVELOPING THE EXPOSED SILVER HALIDE WITH A P-PHENYLENE DIAMINE TYPE DEVELOPING AGENT TO PRODUCE IN THE EXPOSED AREAS OF SAID EMULSION LAYER AN IMAGE OF SAID AZOMETHINE OR QUINONIMINE DYESTUFF, AND

Claim 7

color developing the exposed silver halide with a p-phenylene diamine type developing agent to produce in the exposed areas of said emulsion layer an image of said azomethine or quinonimine dyestuff, and

Claim 8

color developing the exposed silver halide with a p-phenylene diamine type developing agent to produce in the exposed areas of said emulsion layer an image of said azomethine or quinonimine dyestuff, and

Claim 9

A method of producing a colored radiograph according to claim 1 wherein the colorless color coupler is a phenol, -naphthol or 3-pyrazoline-5-one type color coupler.

Claim 10

A method of producing a colored radiograph according to claim 2 wherein the phenol coupler has the following general formula:

Claim 11

removing the silver metal produced during said development with an alkaline oxidizing bleaching solution effecting the oxidative coupling of said hydrazone compound with said colorless color coupler left in the unexposed areas, said color coupler and hydrazone compound being adapted upon such coupling to form a dye image of substantially contrasting color and opposite gradation to the first developed dye image.

Claim 12

removing the silver metal produced during said development with an alkaline oxidizing bleaching solution effecting the oxidative coupling of said hydrazone compound with said colorless color coupler left in the unexposed areas, said color coupler and hydrazone compound being adapted upon such coupling to form a dye image of substantially contrasting color and opposite gradation to the first developed dye image.

Claim 13

REMOVING THE SILVER METAL PRODUCED DURING SAID DEVELOPMENT WITH AN ALKALINE OXIDIZING BLEACHING SOLUTION EFFECTING THE OXIDATIVE COUPLING OF SAID HYDRAZONE COMPOUND WITH SAID COLORLESS COLOR COUPLER LEFT IN THE UNEXPOSED AREAS, SAID COLOR COUPLER AND HYDRAZONE COMPOUND BEING ADAPTED UPON SUCH COUPLING TO FORM A DYE IMAGE OF SUBSTANTIALLY CONTRASTING COLOR AND OPPOSITE GRADATION TO THE FIRST DEVELOPED DYE IMAGE.

Claim 14

REMOVING THE SILVER METAL PRODUCED DURING SAID DEVELOPMENT WITH AN ALKALINE OXIDIZING BLEACHING SOLUTION EFFECTING THE OXIDATIVE COUPLING OF SAID HYDRAZONE COMPOUND WITH SAID COLORLESS COLOR COUPLER LEFT IN THE UNEXPOSED AREAS, SAID COLOR COUPLER AND HYDRAZONE COMPOUND BEING ADAPTED UPON SUCH COUPLING TO FORM A DYE IMAGE OF SUBSTANTIALLY CONTRASTING COLOR AND OPPOSITE GRADATION TO THE FIRST DEVELOPED DYE IMAGE.

Claim 15

A method of producing a colored radiograph according to claim 1 wherein said colorless color coupler and said hydrazone compound are present in sufficient amounts to produce a dye image of contrasting color and opposite gradation having a density equal to at least 50 percent of the maximum density of the main color of said azomethine or quinonimine dyestuff image.