US3527603A - Process for the production of color photographic images by the silver-dye-bleach process - Google Patents

Process for the production of color photographic images by the silver-dye-bleach process Download PDF

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Publication number
US3527603A
US3527603A US625609A US3527603DA US3527603A US 3527603 A US3527603 A US 3527603A US 625609 A US625609 A US 625609A US 3527603D A US3527603D A US 3527603DA US 3527603 A US3527603 A US 3527603A
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US
United States
Prior art keywords
dye
silver
bleach
bath
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US625609A
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English (en)
Inventor
Bernhard Seidel
Jakob Kemmer
Erich Bockly
Eberhard Gunther
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Agfa Gevaert AG
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Agfa Gevaert AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Agfa Gevaert AG filed Critical Agfa Gevaert AG
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Publication of US3527603A publication Critical patent/US3527603A/en
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Classifications

    • 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
    • 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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/40—Chemically transforming developed images
    • G03C5/44—Bleaching; Bleach-fixing

Definitions

  • sion is, of course, greatly reduced. Due to the reduction in sensitivity azo dyes containing photographic materials for the silver-dye-bleach process are not only useless for taking photographs but are generally inferior to photographic copying materials of the conventional composition containing color couplers.
  • the sensitivity of silver-dyebleach materials can be increased by flushing the dyebleach bath with an inert gas, preferably nitrogen, during the dye-bleach process or by using a bath saturated with an inert gas.
  • improvements in the sensitivity usually amounting to 0.1 to 0.9 unit log. I -t (where 0.3 unit log I -t correspond to an increase in sensitivity of one aperture stop) and considerable improvements in the fogging values, have been achieved.
  • the dye-bleach bath Before processing, the dye-bleach bath is saturated with an inert gas, preferably nitrogen. Alternatively the dyebleach bath is saturated with the inert gas and a current of inert gas is also maintained during processing.
  • the inert gas may be introduced either in a continuous stream or intermittently. One may also wash or saturate the rinse baths immediately before the dye-bleach bath with inert gas in order to remove air from the photographic material to be bleached.
  • the process according to the invention is thus characterized by the fact that dyebleaching is accomplished in a bath which has been substantially or completely freed from dissolved oxygen by being saturated with inert gas.
  • Dye-bleaching may be performed either with a single bath or a sequence of two or more baths (in cases in which the dye-bleach process is accomplished in two or more steps).
  • the inert gas treatment completely lacks the above eflect when carried out in the black-white developer.
  • the process according to the invention is thus basically dilferent from treating the color developer with nitrogen in color-forming development, where the essential effect of the nitrogen treatment is the mechanical motion in the developer caused by the ascending gas bubbles and the prevention of atmospheric oxidation of the developer substance.
  • the efiect of the inert gas is greatly assisted by reducing agents such as hydroxylamine or alkali metal sulfite added to the color-forming developer.
  • reducing agents such as hydroxylamine or alkali metal sulfite added to the color-forming developer.
  • Freshly prepared color developers which have the analytical concentration of developer substance accordingly exert their full effect, and the flushing or saturation with inert gas merely serves to maintain this state as long as possible.
  • the process according to the invention provides a bath which is distinctly superior to a freshly prepared bath.
  • the efiect of the process according to the invention was all the more unexpected since most bleaching baths used in practice, especially those based on thiourea or on quinoline-iodide already contain reducing agents. Moreover, the effect of the process according to the invention cannot be achieved by adding other reducing agents.
  • the eifect of the saturation with inert gas can be eliminated by flushing with air or oxygen and can be restored by renewal of introduction of nitrogen.
  • the process according to the invention also has the advantage that, owing to the better utilization of dye and silver, it is possible to use image layers with correspondingly lower silver halide content.
  • the inventive process in addition makes it possible to work with a dye-bleach bath which is not as strongly acid as usual.
  • Bleaching in the presence of inert gas may also be applied for reducing the quantity, e.g., of a bleaching catalyst, so that discoloration of the layer by the action of the catalyst is avoided.
  • the process according to the invention is, of course, not limited to the bleaching of a silver image after blackwhite negative development, but can equally well be applied to the bleaching of positive silver images such as those produced in reverse development or in direct positive processes, e.g., by the bromine ion diffusion process, the silver salt diffusion process or photosolubilization.
  • a silver bromide gelatin emulsion which contains, per kilogram, g. of a cyan dye of the following formula:
  • SOaH 503B the preparation of which has been described in German Auslegeschrift No. 1,041,355, and mg. of a sensitizer disclosed in German Auslegeschrift No. 1,213,240, Example 11.
  • the amount of silver in the finished layer is about 0.5 g. Ag./m.
  • Example 1 which layer has been rendered fast to diffusion by the addition of 3 g. of 4,4-diphenyldibiguanide.
  • the amount of silver in this layer is about 0.55 g. of Ag/m. in the form of silver bromide;
  • the dye-bleach bath is saturated with oxygen before the bleaching process 'but no further gas is introduced during the bleaching process. With this method, only incomplete bleaching is achieved and the following fog values are obtained after drying.
  • EXAMPLE 2 A photographic multilayer material is prepared as described in Example 1, except that the amount of silver in the individual layers is only 65% of the values indicated in Example 1. Such a material is bleached in the course of processing as described in Example 1, to give the following fog values:
  • a bleaching bath containing thiourea is used, e.g., a bath such as described in German Patent No. 1,091,429, Example 5 G.
  • EXAMPLE 3 The following layers are applied to a support of white pigmented cellulose acetate or a support of polyethylene coated paper which has been rendered hydrophilic:
  • a red sensitized silver halide gelatin emulsion layer which contains, per 500 g. of a silver bromide-iodide gelatin emulsion having 6 mol percent of silver iodide, 2.7 g. of the following cyan dye:
  • the amount of silver in the finished layer is about 0.8 g. Ag/m. in the form of silver halide.
  • the amount of silver in the finished layer is about 0.75 g. Ag/m. in the form of silver halide.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US625609A 1966-04-15 1967-03-24 Process for the production of color photographic images by the silver-dye-bleach process Expired - Lifetime US3527603A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEA0052178 1966-04-15
US62560967A 1967-03-24 1967-03-24

Publications (1)

Publication Number Publication Date
US3527603A true US3527603A (en) 1970-09-08

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Family Applications (1)

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US625609A Expired - Lifetime US3527603A (en) 1966-04-15 1967-03-24 Process for the production of color photographic images by the silver-dye-bleach process

Country Status (7)

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US (1) US3527603A (cs)
BE (1) BE696366A (cs)
CH (1) CH483037A (cs)
DE (1) DE1522365A1 (cs)
FR (1) FR1519129A (cs)
GB (1) GB1146119A (cs)
NL (1) NL6704620A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189457A (en) * 1992-01-28 1993-02-23 Eastman Kodak Company Sheet processing apparatus and method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2837988A (en) * 1954-08-02 1958-06-10 Technicolor New York Corp Apparatus for automatically processing a sensitized film in successive steps

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2837988A (en) * 1954-08-02 1958-06-10 Technicolor New York Corp Apparatus for automatically processing a sensitized film in successive steps

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189457A (en) * 1992-01-28 1993-02-23 Eastman Kodak Company Sheet processing apparatus and method

Also Published As

Publication number Publication date
DE1522365A1 (de) 1969-08-14
CH483037A (de) 1969-12-15
BE696366A (cs) 1967-10-02
FR1519129A (fr) 1968-03-29
NL6704620A (cs) 1967-09-25
GB1146119A (en) 1969-03-19

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