Claims
- 1. A method of forming a dye image comprising
- developing to produce a silver image in an imagewise exposed photographic element comprised of a support and at least one radiation-sensitive silver halide layer containing a developable latent image therein,
- poisoning the silver image to inhibit its ability to catalyze a redox reaction between a peroxide oxidizing agent and a silver halide developing agent, wherein the peroxide oxidizing agent and the silver halide developing agent are chosen so that they are essentially inert to oxidation-reduction in the absence of a catalyst,
- rendering undeveloped silver halide remaining in the radiation-sensitive layer developable,
- developing the remaining silver halide to form a reversal silver image,
- catalyzing with the reversal silver image a redox reaction between the peroxide oxidizing agent and the silver halide developing agent, so that oxidized silver halide developing agent is formed in an imagewise manner,
- employing the oxidized silver halide developing agent to create an imagewise distribution of mobile and immobile dyes in a pattern corresponding to the reversal silver image and
- transferring the mobile dye so that a dye image is formed by at least one of the immobile dye retained and the mobile dye transferred.
- 2. A method according to claim 1 wherein the initially developed silver image is poisoned as it is formed.
- 3. A method according to claim 2 wherein the initially developed silver image is formed in a developer solution and a halide ion is incorporated in the developer in a concentration sufficient to poison the initially formed silver image as a redox amplification catalyst for the reaction of the peroxide oxidizing agent and the silver halide developing agent.
- 4. A method according to claim 3 wherein the halide ion is a bromide ion.
- 5. A method according to claim 3 wherein the halide present in the first developer is bromide ion present in a concentration of from 1 to 30 grams per liter.
- 6. A method according to claim 5 wherein the bromide ion is present in a concentration of from 1 to 15 grams per liter.
- 7. A method according to claim 3 wherein the halide ion is an iodide ion.
- 8. A method according to claim 7 wherein the iodide ion is present in the first developer in a concentration of from 1 microgram to 1 gram per liter.
- 9. A method according to claim 8 wherein the iodide ion is present in the first developer in a concentration of from 1 to 10 milligrams per liter.
- 10. A method according to claim 1 wherein the remaining silver halide is developed using a silver halide developer containing a dye developer.
- 11. A method according to claim 1 wherein the photographic element contains associated with the silver halide layer a redox dye-releaser and the silver halide developing agent is a cross-oxidizing developing agent.
- 12. A method according to claim 1 wherein the silver halide layer is negative-working.
- 13. A method according to claim 12 wherein the silver halide is bromoiodide.
- 14. A method of forming a dye image comprising
- developing to produce a silver image an imagewise exposed photographic element comprised of a support, at least one radiation-sensitive silver halide emulsion layer containing a developable latent image and, associated with the emulsion layer, an immobile redox dye-releaser as a dye-image-generating reducing agent,
- poisoning the silver image to inhibit its ability to catalyze a redox reaction between a peroxide oxidizing agent and a cross-oxidizing silver halide developing agent, wherein the peroxide oxidizing agent and the developing agent are chosen so that they are essentially inert to oxidation-reduction in the absence of a catalyst,
- rendering undeveloped silver halide remaining in the radiation-sensitive layer developable,
- developing the remaining silver halide to form a reversal silver image,
- catalyzing with the reversal silver image a redox reaction between the peroxide oxidizing agent and the cross-oxidizing silver halide developing agent to produce oxidized cross-oxidizing silver halide developing agent in an imagewise manner,
- reacting the oxidized cross-oxidizing silver halide developing agent with the immobile redox dye-releaser so that a mobile dye is imagewise released and
- transferring the mobile released dye so that a dye image is formed by at least one of the retained immobile redox dye-releaser and the transferred released dye.
- 15. A method of forming a dye image according to claim 14 wherein the initially formed silver image is developed in a noncross-oxidizing silver halide developer.
- 16. A method of forming a dye image according to claim 15 wherein the initially formed silver image both formed and poisoned with the noncross-oxidizing silver halide developer.
- 17. A method of forming a dye image according to claim 14 wherein iodide ion is employed to poison the initially formed silver image.
- 18. A method of forming a dye image according to claim 16 wherein iodide ion is present in the noncross-oxidizing silver halide developer in a concentration of from 1 milligram per liter to 1 gram per liter.
- 19. A method of forming a dye image according to claim 14 wherein a cross-oxidizing silver halide developer containing the peroxide oxidizing agent and the cross-oxidizing developing agent are brought into contact with the photographic element in performing the second developing step.
- 20. A method of forming a dye image according to claim 14 wherein the photographic element is washed to remove mobile dye and leave a dye image formed by the retained immobile redox dye-releaser.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a division of my application Ser. No. 730,912, filed Oct. 8, 1976, now U.S. Pat. No. 4,089,685, which is a continuation-in-part of my application Ser. No. 628,880, filed Nov. 5, 1975 now abandoned.
US Referenced Citations (6)
Non-Patent Literature Citations (1)
Entry |
Katz & Fogel, "Photographic Analysis", Morgan & Morgan, N.Y., N.Y. .COPYRGT. 1971, p. 102. |
Divisions (1)
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Number |
Date |
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730912 |
Oct 1976 |
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Continuation in Parts (1)
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628880 |
Nov 1975 |
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