CN110161798B - Recyclable color bleaching and fixing liquid - Google Patents
Recyclable color bleaching and fixing liquid Download PDFInfo
- Publication number
- CN110161798B CN110161798B CN201711414766.4A CN201711414766A CN110161798B CN 110161798 B CN110161798 B CN 110161798B CN 201711414766 A CN201711414766 A CN 201711414766A CN 110161798 B CN110161798 B CN 110161798B
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- bleaching
- fixing
- color
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- solution
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- 238000004061 bleaching Methods 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 title abstract description 28
- 239000000243 solution Substances 0.000 claims abstract description 33
- 239000004332 silver Substances 0.000 claims abstract description 20
- 229910052709 silver Inorganic materials 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 13
- 239000007844 bleaching agent Substances 0.000 claims abstract description 9
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 5
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 5
- 239000003223 protective agent Substances 0.000 claims abstract description 5
- 238000010790 dilution Methods 0.000 claims abstract description 4
- 239000012895 dilution Substances 0.000 claims abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical group OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 3
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 claims description 3
- 239000013522 chelant Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- -1 ferrous iron ions Chemical class 0.000 abstract description 13
- 238000005406 washing Methods 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 8
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 4
- 239000003814 drug Substances 0.000 abstract description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 108700024661 strong silver Proteins 0.000 abstract description 2
- 239000000975 dye Substances 0.000 description 6
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 6
- 229910021607 Silver chloride Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- AZQWKYJCGOJGHM-UHFFFAOYSA-N 1,4-benzoquinone Chemical compound O=C1C=CC(=O)C=C1 AZQWKYJCGOJGHM-UHFFFAOYSA-N 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 4
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- UOMQUZPKALKDCA-UHFFFAOYSA-K 2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxymethyl)amino]acetate;iron(3+) Chemical compound [Fe+3].OC(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UOMQUZPKALKDCA-UHFFFAOYSA-K 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- RAABOESOVLLHRU-UHFFFAOYSA-N diazene Chemical compound N=N RAABOESOVLLHRU-UHFFFAOYSA-N 0.000 description 2
- 229910000071 diazene Inorganic materials 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 1
- YHGREDQDBYVEOS-UHFFFAOYSA-N [acetyloxy-[2-(diacetyloxyamino)ethyl]amino] acetate Chemical compound CC(=O)ON(OC(C)=O)CCN(OC(C)=O)OC(C)=O YHGREDQDBYVEOS-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 150000001804 chlorine Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000834 fixative Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
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
- 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
-
- 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
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/42—Bleach-fixing or agents therefor ; Desilvering processes
-
- 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
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/42—Bleach-fixing or agents therefor ; Desilvering processes
- G03C2007/425—Bleach-fixing
Abstract
The invention discloses a recyclable color bleaching and fixing solution, which consists of A, B and C three concentrated solutions, wherein the PH of the A concentrated solution is between 5 and 6, and contains water, a solvent, a fixing agent and a fixing protective agent, the PH of the B concentrated solution is between 5 and 6, and contains water, a bleaching agent and a silver bleaching promoter, and the PH of the C concentrated solution is between 4 and 5, and contains water, an antioxidant and acid; A. and sequentially adding the part B and the part C into water for dilution and dispensing. The novel bleaching and fixing liquid has the advantages of strong silver bleaching capability and strong oxidation resistance, and is suitable for the performance of a widely-used RA-4 color photographic paper high-temperature rapid washing process; the bleaching and fixing liquid converts ferrous iron ions of the ethylenediaminetetraacetic acid ferric salt into ferric iron ions in the washing process, so that other components in the old liquid can play a role again, the pollution to the environment caused by the discharge of bleaching and fixing waste liquid is avoided, and various effective components in the liquid medicine are recycled.
Description
Technical Field
The invention relates to the technical field of post-processing of photosensitive materials, in particular to a recyclable color bleaching solution.
Background
Color photographic systems produce color images by exposing photosensitive materials containing silver chloride couplers to light and developing the color. The color developer converts the exposed silver chloride to metallic silver. The oxidation product of the silver halide and the silver halide respectively generates dyes with yellow, magenta and cyan couplers and releases metallic silver and chloride ions.
Metallic silver impairs the hue of the dye image and must be removed. The conversion of metallic silver to silver ions is the reverse reaction of the development process. The reverse reaction is carried out by bleaching agent in bleaching solution, which is polycarboxyl iron compound, ferric ethylenediamine tetracetate, which is an oxidant for metallic silver, and which oxidizes metallic silver into silver chloride. The ferric salt of the ethylenediaminetetraacetic acid is reduced to ferrous salt of the ethylenediaminetetraacetic acid.
Immediately after completion of the bleaching process, the ferric ethylenediaminetetraacetate ferrous iron is reduced to ferric ethylenediaminetetraacetate by combining with oxygen in the air:
thereby reciprocating and circulating.
Unexposed silver chloride still remains after color development of the color paper. These silver chlorides need to be dissolved and removed, and this process is a fixing process. The present technique employs a fast fixer thiosulfate. Fixing reaction process:
a certain amount of thiosulfate is consumed in the fixing process, and a certain amount of thiosulfate must be added to maintain the balance in order for the amount of thiosulfate to be constant.
In the process of processing color photographic paper, a large amount of developing solution is continuously brought into the bleaching and fixing solution by a wet film, and acid in the bleaching and fixing solution is continuously consumed in the process of washing because the developing solution is alkaline solution. In order to maintain the acidity of the bleach liquor, a certain amount of acid must be added to maintain the equilibrium at a constant pH.
Chloride ion is a development inhibitor, and a chloride salt such as sodium chloride is usually added to the developer to generate chloride ion, which functions to inhibit the formation of development fog. Chlorine ions generated in the developing process are used for replacing artificially added chlorine salt, so that the number of the chlorine ions reaches an equilibrium state. And (2) developing the color photographic paper after exposure, wherein the photographic paper enters a color developing solution, silver ions generated by exposure of silver chloride contained in an emulsion layer on the paper react with a main component developer in the developing solution, and the developer is converted into semi-quinone imine ions:
under the alkaline condition of the developer, the semiquinone imine ion loses one hydrogen atom and becomes a semiquinone free radical:
then, still under the alkaline condition of the developer, the semiquinone free radical reacts with another silver ion to be converted into quinone diimine:
quinone diimines can interconvert structures with semi-quinone diimines:
the colour former in the coating of colour photographic paper also dissociates under the alkaline conditioning of the developer to produce negative ions:
the negative ions of the color coupler react with the semi-quinone diimine with positive electricity to generate the dye leuco:
and the leuco dye reacts with another tautomeric quinonediimine of the semi-quinonediimine to finally produce the dye:
the dye thus produced is the substrate constituting the color image.
The color photographic paper is developed through three processes of developing, bleaching and water washing to obtain the exposed color photographic paper. The large and small color photo developing machines widely used in the market all adopt continuous developing processing, namely the process of continuously supplementing new liquid and abandoning waste liquid (as shown in figure 1), but other components in the old liquid can not be recycled, and the discharge of bleaching waste liquid can cause environmental pollution, so that aiming at the current situation, the development of the recyclable color bleaching and fixing liquid is urgently needed to overcome the defects in the current practical application.
Disclosure of Invention
The present invention aims at providing one kind of color bleaching and fixing liquid capable of being regenerated circularly to solve the problems of the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a recyclable color bleaching and fixing solution consists of A, B and part C concentrated solution, wherein the part A concentrated solution has the pH of 5-6 and comprises water, a solvent, a fixing agent and a fixing protective agent, the part B concentrated solution has the pH of 5-6 and comprises water, a bleaching agent and a silver bleaching promoter, and the part C concentrated solution has the pH of 4-5 and comprises water, an antioxidant and acid; A. and sequentially adding the part B and the part C into water for dilution and dispensing.
As a further scheme of the invention: the fixer in part a is ammonium thiosulfate and the fixing protectant is sulfite.
As a further scheme of the invention: the bleaching agent in part B is an iron polycarboxylate chelate.
As a further scheme of the invention: the acid in the C moiety is a polycarboxylic acid.
As a further scheme of the invention: the color bleaching and fixing liquid is applied to a high-temperature quick developing process of RA-4 color photographic paper, the pH value of the color bleaching and fixing liquid is required to be 5-6, the temperature is 37.8 ℃, and the developing time is 45 seconds.
Compared with the prior art, the invention has the beneficial effects that: the circularly regenerated color bleaching and fixing liquid is one solution with bleaching, fixing and acid neutralizing functions, and has the advantages of powerful silver bleaching capacity and high antioxidant performance, and is suitable for use in high temperature fast flushing process of RA-4 color photographic paper. The bleaching and fixing liquid converts ferrous iron ions of the ethylenediaminetetraacetic acid ferric salt into ferric iron ions in the washing process, so that other components in the old liquid can play a role again, the pollution to the environment caused by the discharge of bleaching and fixing waste liquid is avoided, and various effective components in the liquid medicine are recycled.
Drawings
FIG. 1 is a schematic diagram of a bleaching process of a color photographic developing machine on the market.
FIG. 2 is a schematic flow chart of the recyclable color fixative solution applied to a color photo developing machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, in an embodiment of the present invention, a recyclable color bleaching solution is composed of A, B and part C concentrate, wherein part a concentrate has a PH of 5-6 and contains water, solvent, fixer and fixing protective agent, part B concentrate has a PH of 5-6 and contains water, bleach and silver bleaching promoter, and part C concentrate has a PH of 4-5 and contains water, antioxidant and acid; A. and the B part and the C part are sequentially added into water for dilution and dosage to prepare the three-function-in-one recyclable combined bleaching and replenishing liquid for processing the color photographic paper.
In this embodiment, the fixer in the part a is ammonium thiosulfate, and the fixing protective agent is sulfite.
In this example, the bleaching agent in part B is an iron polycarboxylate chelate,
in this example, the acid in part C is a polycarboxylic acid.
The circularly regenerated color bleaching and fixing liquid is used in fast high temperature flushing of RA-4 color photographic paper, and has pH value of 5-6, temperature of 37.8 deg.c and flushing time of 45 sec. The novel bleaching and fixing solution has the advantages of strong silver bleaching capability and strong oxidation resistance, and is suitable for the performance of a widely-used high-temperature quick washing process of RA-4 color photographic paper. The bleaching and fixing liquid converts ferrous iron ions of the ethylenediaminetetraacetic acid ferric salt into ferric iron ions in the washing process, so that other components in the old liquid can play a role again, the pollution to the environment caused by the discharge of bleaching and fixing waste liquid is avoided, and various effective components in the liquid medicine are recycled.
Because various chemical components are continuously consumed in the bleaching process, the aim is to add the regenerated replenishing liquor into the waste liquor to be prepared and recovered into similar fresh bleaching replenishing liquor, and the similar fresh bleaching replenishing liquor is returned into the washing liquor for reuse, so that the discharge capacity can be reduced by more than 80 percent through repeated circulation, the silver content in the bleaching overflow waste liquor is reduced, and the residual discharged 20 percent of waste liquor can be sent to a sewage treatment plant for unified treatment after the silver is completely extracted by an electrolytic method.
According to the environmental protection requirements of different areas, the bleaching overflow liquid adopts an on-line micro-electrolysis silver removal method (extracting micro silver by low current electrolysis each time, only reducing the silver content of the overflow liquid), and then carries out regeneration reaction, thereby realizing the zero emission of bleaching, realizing the repeated cyclic utilization and utilizing the resources to the maximum extent.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several variations and modifications without departing from the concept of the present invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (5)
1. A recyclable color bleaching and fixing solution consists of A, B and C three-part concentrated solution, and is characterized in that the pH of the part A concentrated solution is between 5 and 6 and contains water, a solvent, a fixing agent and a fixing protective agent, the pH of the part B concentrated solution is between 5 and 6 and contains water, a bleaching agent and a silver bleaching promoter, and the pH of the part C concentrated solution is between 4 and 5 and contains water, an antioxidant and acid; A. and sequentially adding the part B and the part C into water for dilution and dispensing.
2. The recyclable color bleaching solution according to claim 1, wherein the fixer in part a is ammonium thiosulfate and the fixing protectant is sulfite.
3. The recyclable color bleaching solution according to claim 1, wherein the bleaching agent in part B is an iron polycarboxylate chelate.
4. The recyclable color bleaching solution according to claim 1, wherein the acid in the C part is a polycarboxylic acid.
5. The recyclable color bleaching solution according to claim 1, 2, 3 or 4, characterized in that the color bleaching solution is applied to a high temperature fast developing process for RA-4 color photographic paper, and the pH value is 5-6, the temperature is 37.8 ℃, and the developing time is 45 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711414766.4A CN110161798B (en) | 2017-12-25 | 2017-12-25 | Recyclable color bleaching and fixing liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711414766.4A CN110161798B (en) | 2017-12-25 | 2017-12-25 | Recyclable color bleaching and fixing liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110161798A CN110161798A (en) | 2019-08-23 |
| CN110161798B true CN110161798B (en) | 2022-11-15 |
Family
ID=67640943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711414766.4A Active CN110161798B (en) | 2017-12-25 | 2017-12-25 | Recyclable color bleaching and fixing liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110161798B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046395A (en) * | 1990-05-28 | 1990-10-24 | 刘树斌 | Apparent fixing liquor and developing technique that colour negative and printing paper are general |
| CN1054323A (en) * | 1990-02-20 | 1991-09-04 | 中国科学院大连化学物理研究所 | Direct synthesis technique system concentrated colour bleach-fixing liquid |
| EP1209520A1 (en) * | 2000-11-28 | 2002-05-29 | Eastman Kodak Company | Ferrous photographic bleach-fixing precursor compositions and methods for their use |
| JP2005316251A (en) * | 2004-04-30 | 2005-11-10 | Fuji Photo Film Co Ltd | Concentrated bleaching composition for silver halide color photographic sensitive material and processing method |
-
2017
- 2017-12-25 CN CN201711414766.4A patent/CN110161798B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1054323A (en) * | 1990-02-20 | 1991-09-04 | 中国科学院大连化学物理研究所 | Direct synthesis technique system concentrated colour bleach-fixing liquid |
| CN1046395A (en) * | 1990-05-28 | 1990-10-24 | 刘树斌 | Apparent fixing liquor and developing technique that colour negative and printing paper are general |
| EP1209520A1 (en) * | 2000-11-28 | 2002-05-29 | Eastman Kodak Company | Ferrous photographic bleach-fixing precursor compositions and methods for their use |
| JP2005316251A (en) * | 2004-04-30 | 2005-11-10 | Fuji Photo Film Co Ltd | Concentrated bleaching composition for silver halide color photographic sensitive material and processing method |
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| Publication number | Publication date |
|---|---|
| CN110161798A (en) | 2019-08-23 |
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