US3868253A - Process for the rapid processing of silver dye bleach material - Google Patents

Process for the rapid processing of silver dye bleach material Download PDF

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US3868253A
US3868253A US333249A US33324973A US3868253A US 3868253 A US3868253 A US 3868253A US 333249 A US333249 A US 333249A US 33324973 A US33324973 A US 33324973A US 3868253 A US3868253 A US 3868253A
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bath
silver
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bleach
baths
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Max Marthaler
Ulrich Frauchiger
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Ilford Imaging Switzerland GmbH
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Ciba Geigy AG
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/164—Rapid access processing

Definitions

  • the present invention relates to a rapid processing method of silver bleach materials.
  • the bath sequence is: (1) silver developing bath, (2) dye bleach bath (3) bleach fixing bath, (4) silver halide fixing bath and (5) soaking bath. Baths (1) and (2) each contain dye bleach catalyst, the material passing from (1) directly into (2).
  • the whole processing is carried out at temperatures of 20 to 50C. The whole process lasts at most 6 minutes, the dwell time in the individual baths being at most 2 minutes.
  • the material is soaked after the dye bleach bath, the metallic silver is oxidised in a silver bleach bath, the material is again soaked and the silver salts are either converted into complexes which are insensitive to light (stabilisation process) or are eluted after conversion into watersoluble complexes (fixing process).
  • the process according to the invention for the rapid processing of silver dye bleach material using the bath sequence (1) silver developing bath, (2) dye bleach bath, (3) bleach-fixing bath, (4) silver halide fixing bath and (5) soaking bath, with both the silver develop ing bath (1) and the dye bleach bath (2) containing a dye bleach catalyst and the silver dye bleach material to be processed passing from a silver developing bath (1) directly into a dye bleach bath (2), is characterised in that the entire processing, from entry into the first bath l to leaving the last bath (5) lasts at most 6 minutes at tempeatures between 20 and 50C and that the dwell time in each individual bath is at most 2 minutes.
  • the acid dye bleach bath (2) follows, without intermediate soaking, onto an alkaline silver developing bath l which is appropriately free of carbonates, the concentration of the dye bleach catalyst in the silver developing bath (1) being so chosen, advantageously, that the loss in effectiveness of the dye bleach bath (2), caused by consumption and/or carrying over of the bath liquid, is reduced to a minimum.
  • the catalyst concentration in the silver developing bath is as a rule 10 percent to 300 percent higher than the concentration in the dye bleach bath.
  • the bleach-fixing bath according to the invention which preferably has a pH value of at most 4 and contains an oxidising agent which is effective in the acid bath, preferably a nitro compound, especially a nitrobenzenesulphonic acid such as, for example, 2,4-dinitrobenzenesulphonic acid, bleaches the silver very rapidly but is not capable of completing the fixing within the short time that it acts, so that, according to the invention, the material is additionally treated with a silver halide fixing bath which appropriately contains, in addition to a relatively rapidly acting silver salt solvent, a high amount of sulphite, for example more than 20 g/l, to act as a buffer against acid carried into the bath and to render carried-over oxidising agent harmless.
  • an oxidising agent which is effective in the acid bath
  • a nitro compound especially a nitrobenzenesulphonic acid such as, for example, 2,4-dinitrobenzenesulphonic acid
  • thiourea is used as the silver salt solvent in the bleach-fixing bath (3).
  • All baths including the soaking baths, can contain additives such as hardeners, wetting agents, optical brighteners and UV-protection agents.
  • the preferred processing temperature is between 30 and 40C.
  • the lightsensitive layers are present on at least one side of this carrier, preferably in the known arrangement, that is to say a red-sensitised silver halide emulsion layer. which contains a cyan'azo dyestuff, as the bottom layer, on top of this a green-sensitised silver halide emulsion layer which contains a magenta azo dyestuff, and uppermost a blue-sensitive halide emulsion layer which contains a yellow azo dyestuff.
  • the material can also contain base layers, intermediate layers, filter layers and protective layers but the total thickness of the laycrs should as a rule not exceed 20 [.L.
  • Phenazines, quinoxalines and pyrazines can preferably be employed as dye bleach catalysts for the process according to the invention.
  • the concentration of the baths can be so adjusted, by simple experiments, that the dwell times in the individual baths are in the ratio of small integers.
  • the ma terial can be processed in an automatic developing machine which contains 5 to 20 tanks and where the dwell time per tank is to 30 seconds.
  • the bath system according to the invention has proved particularly stable to contamination by bath material being carried over, so that constant results are obtained even after processing major amounts of exposed colour material.
  • Example 1 in the green-sensitive layer, above it, the magenta image dyestuff of the formula IIO S and in the topmost bluesensitive layer, the yellow image dyestuff of the formula s out
  • the image dyestuffs are incorporated into the emulsions at a reflectance density of D 2.0.
  • the colour layers, containing a total of 0.8 g of Ag/m are sepa- 7 rated by gelatine layers, the total thickness being ,u..
  • This material is exposed by flashlight in a commercially available automatic portrait machine and is sub- Na metaborate g/l 40 seconds 40 seconds 40 seconds tinoise Na bisulphite 10 g/l Passage time seconds 5 times, soaking bath Passage time seconds CH: S Oall 280 seconds Total processing time I 4 minutes 40 seconds)
  • After drying by means of warm air images having a good white, especially good white edge, and a true-tonature reproduction, in colour and tonal values, of the person photographed, are obtained. Even after the passage of 750 to 1,000 images of passport photograph size, 4 cm X 5 cm, over the course of l0 days, images of practically unchanged quality can still be produced.
  • Example 1 The process described in Example 1 is repeated. However, instead of the bleach-fixing bath according to the invention. a bath according to US Pat. Specification No. 3,335,004 (Example 1), of the. following composition, is employed:
  • Example 2 ln another type of automatic machine, only 10 tanks are available for processing; the dwell time is separately adjustable for each tank.
  • the exposed material here passes through the same baths as in Example 1, but with the following processing sequence (temperature C):
  • Process for the rapid processing of silver dye bleach materials which comprises using the bath sequence (l silver developing bath, (2) dye bleach bath, (3) bleach-fixing bath, (4) silver halide fixing bath and (5) soaking bath, with both the silver developing bath (1) and the dye bleach bath (2) containing a dye bleach catalyst and the silver dye bleach material to be processed passing from a silver developing bath 1) directly into a dye bleach bath (2), the entire processing, from entry into the first bath l to leaving the last bath (5) lasting at most 6 minutes at temperatures of 20 to 50C and the dwell time in the individual baths being at most 2 minutes.
  • bath sequence l silver developing bath, (2) dye bleach bath, (3) bleach-fixing bath, (4) silver halide fixing bath and (5) soaking bath, with both the silver developing bath (1) and the dye bleach bath (2) containing a dye bleach catalyst and the silver dye bleach material to be processed passing from a silver developing bath 1) directly into a dye bleach bath (2), the entire processing, from entry into the first bath l to leaving the last bath (5) lasting at most 6 minutes at temperatures of 20 to 50
  • Process according to claim 2 which comprises using a bleach-fixing bath (3) with a pH value of at most 4 and containing an oxidising agent which is effective in an acid bath and using a silver halide fixing bath (4) that contains, in addition to a relatively rapidly acting silver salt solvent, more than 20 g/l of sulphite.
  • Process according to claim 1 which comprises di viding at least one of the five baths into a plurality of units which are connected directly one behind the other.
  • Process according to claim 7 which comprises using several dye bleach baths (2).
  • Process according toclaim 7 which comprises using several bleach-fixing baths (3).
  • Process according to claim 7 which comprises using several silver halide fixing baths (4).
  • Process according to claim 7 which comprises using several soaking baths (5).

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

The present invention relates to a rapid processing method of silver bleach materials. The bath sequence is: (1) silver developing bath, (2) dye bleach bath (3) bleach fixing bath, (4) silver halide fixing bath and (5) soaking bath. Baths (1) and (2) each contain dye bleach catalyst, the material passing from (1) directly into (2). The whole processing is carried out at temperatures of 20* to 50*C. The whole process lasts at most 6 minutes, the dwell time in the individual baths being at most 2 minutes.

Description

United States Patent Marthaler et al.
[451 Feb. 25, 1975 PROCESS FOR THE RAPID PROCESSING OF SILVER DYE BLEACH MATERIAL Inventors: Max Marthaler, Marly-le-Petit;
Ulrich Frauchiger, Marly, both of Switzerland Assignee: Ciba-Geigy AG, Basle, Switzerland Filed: Feb. 16, 1973 Appl. No.: 333,249
Foreign Application Priority Data Feb. 28, 1972 Switzerland 2770/72 U.S. Cl. 96/53, 96/60 BF, 96/61 R Int. Cl. G03c 7/00, G03c 5/32, G03c 5/38 Field of Search 96/53, 61 R, 60 BF, 20
References Cited UNITED STATES PATENTS 11/1964 Dreyfuss 96/53 3,394,004 7/1968 Anderau et al. 96/53 Primary Examiner-David Klein Assistant Examiner-Richard L. Schilling Attorney, Agent, or Firm-Joseph G. Kolodny; Edward McC. Roberts; Prabodh l. Almaula [57] ABSTRACT The present invention relates to a rapid processing method of silver bleach materials. The bath sequence is: (1) silver developing bath, (2) dye bleach bath (3) bleach fixing bath, (4) silver halide fixing bath and (5) soaking bath. Baths (1) and (2) each contain dye bleach catalyst, the material passing from (1) directly into (2). The whole processing is carried out at temperatures of 20 to 50C. The whole process lasts at most 6 minutes, the dwell time in the individual baths being at most 2 minutes.
13 Claims, No Drawings PROCESS FOR THE RAPID PROCESSING OF SILVER DYE BLEACH MATERIAL 1n the modern photographic industry, the factor of time plays an increasingly important role. An increase in the speed of photographic materials is desired in order to shorten the exposure time. The duration of wet processes is being shortened, or they are even being replaced by dry processes. The finishing of an image im mediately after exposure is aimed at in copying establishments, and is also finding progressively more acceptance in the practice of taking photographs. Materials, especially colour materials, for cameras which also perform the developing, or for automatic equipment, are therefore of topical interest. Such colour materials and processes for their development are described, for example, in DT-OS 2,128,801, DT-AS 1,547,759 and DT-AS 1,547,720. The colour images obtained according to these processes are however insufficiently stable to light, the colour reproduction is unsatisfactory or the manufacture of the material is expensive,
These disadvantages can be counteracted if a conventional silver dye bleach material is used as the colour material. However, it has not hitherto been possible to use the silver dye bleach material in the rapid pro duction of colour images, because of the long treatment time, which is at least half an hour.
It is also known from the literature to process silver dye bleach material in a ten-step process, DT-OS 1,472,811; DT-OS 1,924,723; E. Mutter, Farbphotographic Theorie and Praxis (Colour Photography in Theory and Practice), Springer Verlag (1967), page 57. It has also been disclosed, from German Patent Specification No. 1,190,788, that the dye bleach catalyst can be added to the developing bath and that the dye bleach bath can contain small amounts of bleach catalyst.
According to the customary processing methods, the material is soaked after the dye bleach bath, the metallic silver is oxidised in a silver bleach bath, the material is again soaked and the silver salts are either converted into complexes which are insensitive to light (stabilisation process) or are eluted after conversion into watersoluble complexes (fixing process).
It is also known to combine the silver bleach bath and the fixing bath in a bleach-fixing bath (compare Swiss Patent Specification No. 336,257), of which the action time is determined by the slowest of the two processes, that is to say if the bleaching takes place slowly the good fixing action is of no avail and conversely, if the fixing takes place slowly, the good bleaching action is of no avail. Hence, the rapidly acting bleach-fixing baths require the combination of a strong oxidising agent with a strong complex-forming agent. Such a combination, like the known Farmer's Reducer, is how ever not stable.
A rapid processing method which does not suffer from the abovementioned disadvantages has now been discovered.
The process according to the invention for the rapid processing of silver dye bleach material, using the bath sequence (1) silver developing bath, (2) dye bleach bath, (3) bleach-fixing bath, (4) silver halide fixing bath and (5) soaking bath, with both the silver develop ing bath (1) and the dye bleach bath (2) containing a dye bleach catalyst and the silver dye bleach material to be processed passing from a silver developing bath (1) directly into a dye bleach bath (2), is characterised in that the entire processing, from entry into the first bath l to leaving the last bath (5) lasts at most 6 minutes at tempeatures between 20 and 50C and that the dwell time in each individual bath is at most 2 minutes.
In the process according to the invention the acid dye bleach bath (2) follows, without intermediate soaking, onto an alkaline silver developing bath l which is appropriately free of carbonates, the concentration of the dye bleach catalyst in the silver developing bath (1) being so chosen, advantageously, that the loss in effectiveness of the dye bleach bath (2), caused by consumption and/or carrying over of the bath liquid, is reduced to a minimum. The catalyst concentration in the silver developing bath is as a rule 10 percent to 300 percent higher than the concentration in the dye bleach bath.
The bleach-fixing bath according to the invention, which preferably has a pH value of at most 4 and contains an oxidising agent which is effective in the acid bath, preferably a nitro compound, especially a nitrobenzenesulphonic acid such as, for example, 2,4-dinitrobenzenesulphonic acid, bleaches the silver very rapidly but is not capable of completing the fixing within the short time that it acts, so that, according to the invention, the material is additionally treated with a silver halide fixing bath which appropriately contains, in addition to a relatively rapidly acting silver salt solvent, a high amount of sulphite, for example more than 20 g/l, to act as a buffer against acid carried into the bath and to render carried-over oxidising agent harmless.
ln a preferred embodiment of the process according to the invention thiourea is used as the silver salt solvent in the bleach-fixing bath (3).
In order to ensure that the processed material is completely stable, it is important to free the processed material completely of the bath components which it carried with it. In a preferred embodiment of the process according to the invention this is done by allowing the material finally to pass through several soaking baths (5).
For better processing it is of advantage also to repeat all other treatment stages (1) to (4), at least once.
If the number of available tanks and the time programme permit it, it is also possible to employ soaking baths between baths having various effects, except between the silver developing baths (l) and the dye bleach baths (2).
All baths, including the soaking baths, can contain additives such as hardeners, wetting agents, optical brighteners and UV-protection agents.
The preferred processing temperature is between 30 and 40C.
The process according to the invention can be used,
for example, in the manufacture of positive colour imsists of paper felt the latter must be lacquered, or coated with polyethylene, on both sides. The lightsensitive layers are present on at least one side of this carrier, preferably in the known arrangement, that is to say a red-sensitised silver halide emulsion layer. which contains a cyan'azo dyestuff, as the bottom layer, on top of this a green-sensitised silver halide emulsion layer which contains a magenta azo dyestuff, and uppermost a blue-sensitive halide emulsion layer which contains a yellow azo dyestuff. The material can also contain base layers, intermediate layers, filter layers and protective layers but the total thickness of the laycrs should as a rule not exceed 20 [.L.
Phenazines, quinoxalines and pyrazines can preferably be employed as dye bleach catalysts for the process according to the invention.
The concentration of the baths can be so adjusted, by simple experiments, that the dwell times in the individual baths are in the ratio of small integers. Thus the ma terial can be processed in an automatic developing machine which contains 5 to 20 tanks and where the dwell time per tank is to 30 seconds.
The bath system according to the invention has proved particularly stable to contamination by bath material being carried over, so that constant results are obtained even after processing major amounts of exposed colour material.
Example 1 in the green-sensitive layer, above it, the magenta image dyestuff of the formula IIO S and in the topmost bluesensitive layer, the yellow image dyestuff of the formula s out The image dyestuffs are incorporated into the emulsions at a reflectance density of D 2.0. The colour layers, containing a total of 0.8 g of Ag/m are sepa- 7 rated by gelatine layers, the total thickness being ,u..
This material is exposed by flashlight in a commercially available automatic portrait machine and is sub- Na metaborate g/l 40 seconds 40 seconds 40 seconds tinoise Na bisulphite 10 g/l Passage time seconds 5 times, soaking bath Passage time seconds CH: S Oall 280 seconds Total processing time I 4 minutes 40 seconds) After drying by means of warm air, images having a good white, especially good white edge, and a true-tonature reproduction, in colour and tonal values, of the person photographed, are obtained. Even after the passage of 750 to 1,000 images of passport photograph size, 4 cm X 5 cm, over the course of l0 days, images of practically unchanged quality can still be produced.
Equally good results are obtained in the same tank installation if finally only 4 soakings are carried out (total time of 4 minutes seconds); in this case the fourteenth tank is used to wash the holder used for transporting the material, and which is now empty. Less good results are obtained in accordance with the following methods of working A and B which deviate from the process according to the invention.
A. The indicated procedure is followed but the developer solution does not contain a dye bleach catalyst. As a difference from Example 1, the concentration of the dye bleach catalyst and the dye bleach bath is raised from 80 mg/litre to 120 mg/litre. Whilst images developed in fresh solutions show a white edge and usable quality in respect of skin colour and tonal values, the quality of the images progressively deteriorates on further use of the solutions. After about 750 images have been developed, sufficiently light images with a white edge can no longer be produced even by adapting the exposure time. The effectiveness of the dye bleach bath has decreased so greatly that the dyestuffs are no longer bleached completely.
B. The process described in Example 1 is repeated. However, instead of the bleach-fixing bath according to the invention. a bath according to US Pat. Specification No. 3,335,004 (Example 1), of the. following composition, is employed:
Potassium ferricyanide 35 g/l Ammonium thiocyanate 90 g/l Potassium bichromate 245 g/l Tertiary Nu phosphate 10 g/l The developed silver is only oxidised insufficiently in this bleach-fixing bath. The images developed in this way show an unattractive yellow-brown image edge.
Example 2 ln another type of automatic machine, only 10 tanks are available for processing; the dwell time is separately adjustable for each tank.
The exposed material here passes through the same baths as in Example 1, but with the following processing sequence (temperature C):
Total processing time (6 minutes) The image quality and the utilisability of the solutions are as good as in Example 1.
360 seconds LII Equally good results are obtained if instead of using the dye bleach bath according to Example I a dye bleach bath of the following composition is used:
Sulphuric acid, 96% strength 20 ml/l Thiomalic acid (mercaptosuecinic acid) I g/l Potassium iodide 20 g/l Catalyst:
2.3-Bis-(hydroxyntethyl)-6.7-dimethoxyquinoxalinc mg/l We claim:
1. Process for the rapid processing of silver dye bleach materials which comprises using the bath sequence (l silver developing bath, (2) dye bleach bath, (3) bleach-fixing bath, (4) silver halide fixing bath and (5) soaking bath, with both the silver developing bath (1) and the dye bleach bath (2) containing a dye bleach catalyst and the silver dye bleach material to be processed passing from a silver developing bath 1) directly into a dye bleach bath (2), the entire processing, from entry into the first bath l to leaving the last bath (5) lasting at most 6 minutes at temperatures of 20 to 50C and the dwell time in the individual baths being at most 2 minutes.
2. Process according to claim 1, which comprises so chosing the concentration of the dye bleach catalyst in the silver developing bath (1) that the loss in effectiveness caused by the consumption of catalyst in the dye bleach bath (2) is minimized.
3. Process according to claim 2, which comprises using a bleach-fixing bath (3) with a pH value of at most 4 and containing an oxidising agent which is effective in an acid bath and using a silver halide fixing bath (4) that contains, in addition to a relatively rapidly acting silver salt solvent, more than 20 g/l of sulphite.
4. Process according to claim 3 which comprises using a nitro compound as an oxidising agent.
5. Process according to claim 4 which comprises using a nitrobenzenesulphonic acid as a nitro compound.
6. Process according to claim 3 which comprises using thiourea as the silver salt solvent in the bleachfixing bath (3).
7. Process according to claim 1 which comprises di viding at least one of the five baths into a plurality of units which are connected directly one behind the other.
8. Process according to claim 7 which comprises using several silver developing baths (1).
9. Process according to claim 7 which comprises using several dye bleach baths (2).
10. Process according toclaim 7 which comprises using several bleach-fixing baths (3).
11. Process according to claim 7 which comprises using several silver halide fixing baths (4).
12. Process according to claim 7 which comprises using several soaking baths (5).
13. Process according to claim 1, characterised in that the dwell times in the individual baths are in the ratio of smaller integers.
l l l=

Claims (13)

1. PROCESS FOR THE RAPID PROCESSING OF SILVER DYE BLEACH MATERIALS WHICH COMPRISES USING THE BATH SEQUENCE (1) SILVER DEVELOPING BATH, (2) DYE BLEACH BATH, (3) BLEACH-FIXING BATH, (4) SILVER HALIDE FIXING BATH AND (5) SOAKING BATH, WITH BOTH THE SILVER DEVELOPING BATH (1) AND THE DYE BLEACH BATH (2) CONTAINING A DYE BLEACH CATALYST AND THE SILVER DYE BLEACH MATERIAL TO BE PROCESSED PASSING FROM A SILVER DEVELOPING BATH (1) DIRECTLY INTO A DYE BLEACH BATH (2), THE ENTIRE PROCESSING, FROM ENTRY INTO THE FIRST BATH (1) TO LEAVING THE LAST BATH (5) LASTING AT MOST 6 MINUTES AT TEMPERATURES OF 20* TO 50*C AND THE DWELL TIME IN THE INDIVIDUAL BATHS AT MOST 2 MINUTES.
2. Process according to claim 1, which comprises so chosing the concentration of the dye bleach catalyst in the silver developing bath (1) that the loss in effectiveness caused by the consumption of catalyst in the dye bleach bath (2) is minimised.
3. Process according to claim 2, which comprises using a bleach-fixing bath (3) with a pH value of at most 4 and containing an oxidising agent which is effective in an acid bath and using a silver halide fixing bath (4) that contains, in addition to a relatively rapidly acting silver salt solvent, more than 20 g/l of sulphite.
4. Process according to claim 3 which comprises using a nitro compound as an oxidising agent.
5. Process according to claim 4 which comprises using a nitrobenzenesulphonic acid as a nitro compound.
6. Process according to claim 3 which comprises using thiourea as the silver salt solvent in the bleach-fixing bath (3).
7. Process according to claim 1 which comprises dividing at least one of the five baths into a plurality of units which are connected directly one behind the other.
8. Process according to claim 7 which comprises using several silver developing baths (1).
9. Process according to claim 7 which comprises using several dye bleach baths (2).
10. Process according to claim 7 which comprises using several bleach-fixing baths (3).
11. Process according to claim 7 which comprises using several silver halide fixing baths (4).
12. Process according to claim 7 which comprises using several soaking baths (5).
13. Process according to claim 1, characterised in that the dwell times in the individual baths are in the ratio of smaller integers.
US333249A 1972-02-28 1973-02-16 Process for the rapid processing of silver dye bleach material Expired - Lifetime US3868253A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961957A (en) * 1973-05-18 1976-06-08 Ciba-Geigy Ag Dye bleach preparation for the photographic silver dye bleach process
US3963492A (en) * 1973-10-12 1976-06-15 Ciba-Geigy Ag Method for processing silver dye bleach materials
US4014698A (en) * 1974-07-10 1977-03-29 Ciba-Geigy Ag Method for processing silver dye bleach materials
US4232112A (en) * 1978-02-10 1980-11-04 Konishiroku Photo Industry Co., Ltd. Process for treating silver halide color photographic photosensitive material
US4343892A (en) * 1979-05-11 1982-08-10 Fuji Photo Film Co., Ltd. Method and apparatus for silver recovery during photographic processing
US4868098A (en) * 1987-01-06 1989-09-19 Ciba-Geigy Ag Method of processing exposed photographic silver dye bleach materials comprising heating after processing liquid application

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156561A (en) * 1958-06-03 1964-11-10 Ciba Geigy Corp Method of producing color photographic pictures
US3394004A (en) * 1964-03-20 1968-07-23 Ciba Ltd Photographic material for the silver dyestuff bleaching process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156561A (en) * 1958-06-03 1964-11-10 Ciba Geigy Corp Method of producing color photographic pictures
US3394004A (en) * 1964-03-20 1968-07-23 Ciba Ltd Photographic material for the silver dyestuff bleaching process

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961957A (en) * 1973-05-18 1976-06-08 Ciba-Geigy Ag Dye bleach preparation for the photographic silver dye bleach process
US3963492A (en) * 1973-10-12 1976-06-15 Ciba-Geigy Ag Method for processing silver dye bleach materials
US4014698A (en) * 1974-07-10 1977-03-29 Ciba-Geigy Ag Method for processing silver dye bleach materials
US4232112A (en) * 1978-02-10 1980-11-04 Konishiroku Photo Industry Co., Ltd. Process for treating silver halide color photographic photosensitive material
US4343892A (en) * 1979-05-11 1982-08-10 Fuji Photo Film Co., Ltd. Method and apparatus for silver recovery during photographic processing
US4868098A (en) * 1987-01-06 1989-09-19 Ciba-Geigy Ag Method of processing exposed photographic silver dye bleach materials comprising heating after processing liquid application

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AT326479B (en) 1975-12-10
ES412087A1 (en) 1975-12-01
JPS48100136A (en) 1973-12-18
IE37290L (en) 1973-08-28
DE2309526A1 (en) 1973-09-06
CA1006038A (en) 1977-03-01
IT977510B (en) 1974-09-20
IE37290B1 (en) 1977-06-22
FR2174061B1 (en) 1976-05-21
BE796005A (en) 1973-08-27
NL7302829A (en) 1973-08-30
FR2174061A1 (en) 1973-10-12
GB1394657A (en) 1975-05-21
ZA731019B (en) 1973-11-28
CH576158A5 (en) 1976-05-31
ATA173973A (en) 1975-02-15

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