GB2305510A - Photographic bleach composition - Google Patents
Photographic bleach composition Download PDFInfo
- Publication number
- GB2305510A GB2305510A GB9619295A GB9619295A GB2305510A GB 2305510 A GB2305510 A GB 2305510A GB 9619295 A GB9619295 A GB 9619295A GB 9619295 A GB9619295 A GB 9619295A GB 2305510 A GB2305510 A GB 2305510A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- ferric
- complex
- bleaching
- aminopolycarboxylic acid
- 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.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims description 45
- 239000007844 bleaching agent Substances 0.000 title claims description 21
- 238000004061 bleaching Methods 0.000 claims description 48
- 239000002253 acid Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 16
- XWSGEVNYFYKXCP-UHFFFAOYSA-N 2-[carboxymethyl(methyl)amino]acetic acid Chemical compound OC(=O)CN(C)CC(O)=O XWSGEVNYFYKXCP-UHFFFAOYSA-N 0.000 claims description 15
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 14
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 12
- XNCSCQSQSGDGES-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]propyl-(carboxymethyl)amino]acetic acid Chemical compound OC(=O)CN(CC(O)=O)C(C)CN(CC(O)=O)CC(O)=O XNCSCQSQSGDGES-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- -1 silver halide Chemical class 0.000 claims description 6
- 239000000243 solution Substances 0.000 description 28
- 239000003446 ligand Substances 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 12
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 7
- 239000008139 complexing agent Substances 0.000 description 7
- 235000014413 iron hydroxide Nutrition 0.000 description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001447 ferric ion Inorganic materials 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 150000003863 ammonium salts Chemical class 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- OSIVBHBGRFWHOS-UHFFFAOYSA-N dicarboxycarbamic acid Chemical compound OC(=O)N(C(O)=O)C(O)=O OSIVBHBGRFWHOS-UHFFFAOYSA-N 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- LMSDCGXQALIMLM-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]acetic acid;iron Chemical compound [Fe].OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O LMSDCGXQALIMLM-UHFFFAOYSA-N 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical compound NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 150000007933 aliphatic carboxylic acids Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000004599 antimicrobial Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 150000004698 iron complex Chemical class 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000003352 sequestering agent Substances 0.000 description 1
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
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
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/42—Bleach-fixing or agents therefor ; Desilvering processes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
t.
1 2305510 IMPROVED PHOTOGRAPHIC BLEACHING COMPOSITIONS AND METHOD OF PHOTOGRAPHIC PROCESSING USING MIXTURE OF FERRIC COMPLEXES This invention relates to a photographic bleaching composition containing a mixture of bidentate ferric complexes, one being a bleaching agent and the other acting as a anti-microbial agent. This invention also pertains to method of photographic processing 10 using such a composition.
To bleach the silver formed during processing of imagewise exposed col.or photographic materials, it is common practice to use ferric complexes of polycarboxylic acid salts. Common complexing agents used into the bleaching composition to form ferric complexes are aminopolycarboxylic acids, such as ethylenediaminetetraacetic acid (EDTA). However, EDTA is known to be minimally biodegradable.
A number of publications are directed to bleaching compositions containing readily biodegradable complexing agent. For example, US-A-5, 061,608 discloses an environmental photographic bleaching solution for use in the color processing of photographic elements that contains as bleaching agent, a potassium salt of a ferric complex of an aminopolycarboxylic acid.
US-A-5,238,791 describes a bleaching solution containing an iron(III) complex salt in which at least 20 mol % of the complexing agent is derived from a nitrilotricarboxylic acid, for example nitrilotriacetic acid (NTA), or nitrilodiaceticmonopropionic acid (ADA). The remaining iron(III) complex can be EDTA or propylenediamine-tetraacetic acid (PDTA). The pH of the sol.ption is at most 4.5 and the bleaching composition further contains an excess of free complexing agent of 1 to 120 mol %, preferably 5 to 20 2 mol %, based on the iron complex or the iron complex salt.
According to US-A-5,238,791, while the nitrilotricarboxylic acid complexing agents are readily biodegradable, they suffer from the disadvantage that their iron complex salts are hydrolyzed excessively in the water wash following the bleach bath as a consequence of the dilution. This leads to the precipitation of iron hydroxide (which is a rust colored precipitate).
DE 4,226,372 describes the uses of additives such as tartaric acid or citric acid to inhibit the formation of iron hydroxide. Although these additives may suppress the formation of iron hydroxide, they do so in a limited way and are sensitive to concentration and other system factors like the rate of the water wash following the bleach bath. Specifically, the use of citric acid can promote the formation of biological growth.
In US-A-5,149,618, bleaching solutions are described as containing at least 50 mol % of one or more ferric complexes of such ligands as ADA with the remainder of the complexes being Fe-EDTA, Fe-PDTA, Fe NTA or mixtures thereof.
US-A-5,061,608 describes a rehalogenating bleaching solution that is more environmentally suitable, comprising one or more ferric complexes of aminopolycarboxylic acids. Mixtures noted therein include a mixture of EDTA and PDTA, a mixture of EDTA and methyliminodiacetic acid (MIDA), and a mixture of MIDA and iminodiacetic acid (IDA). No ratios of the complexes are described for such mixtures. Similar mixtures are described in US-A-4,921,779, US-A4, 960,682 and US-A-4,975,356 for bleaching reversal films.
EP-A-0 545 464 Al discloses a photographic bleaching solution that contains the ferric complex of 3 an alkyliminodiacetic acid, such as MIDA, as a bleaching agent. This bleaching solution is advantageously readily biodegradable and provides a high bleaching performance. A shortcoming of this bleaching solution is also the formation of iron hydroxide and biological growth in the wash bath following the bleaching bath.
It would be desirable to provide a photographic bleaching composition that is readily biodegradable, has good bleaching ability, and does not promote the formation of iron hydroxide and biological growth in the wash bath following the bleaching step.
The problems noted above are solved with a silver halide photographic bleach composition comprising a mixture of a first ferric aminopolycarboxylic acid complex and a second ferric aminopolycarboxylic acid complex, the bleach composition characterized wherein the first ferric aminopolycarboxylic acid complex being a ferric complex of a first aminopolycarboxylic acid which is either iminodiacetic acid or alkyliminodiacetic acid, the second ferric aminopolycarboxylic acid being a ferric complex of a second aminopolycarboxylic acid which is either ethylenediaminetetraacetic acid or propylenediaminetetraacetic acid, and the molar ratio of the first ferric aminopolycarboxylic complex to the second ferric aminopolycarboxylic acid complex being at least 2:1.
This invention also provides a method of processing a color developed, color photographic silver halide material with the bleaching composition described above.
This invention provides a photographic bleaching composition having good bleaching performance. Further, the bleaching composition inhibits the formation of iron hydroxide and biological 4 growth in the bleaching bath as well as the following wash bath. Moreover, the present bleaching composition is readily biodegradable, since the first ferric complex that is predominant in the mixture, is formed 5 with a readily biodegradable aminocarboxylic acid complexing agent, that is, either iminodiacetic acid or an alkyliminodiacetic acid. The formation of iron hydroxide and biological growth is unexpectedly inhibited because of the presence of even a very low amount of the second ferric aminopolycarboxylic acid complex formed from either EDTA or PDTA.
FIG. 1 is a bar graph showing the results of rust formation test described in the Example below.
The mixture of ferric complexes in the bleaching composition of this invention contains a first ferric complex of a first complexing aminopolycarboxylic acid ligand that is iminodiacetic acid (IDA) or an alkyliminodiacetic acid [such as methyliminodiacetic acid (MIDA) or ethyliminadiacetic acid]. These complexing ligands are well known in the art, and can be readily obtained from various commercial sources. Preferably, the first aminopolycarboxylic acid is iminodiacetic acid or methyliminodiacetic acid. The preferred acid is methyliminodiacetic acid.
The first aminopolycarboxylic acid ligand can be used in the free acid form or as a sodium, potassium or ammonium salt.
The second ferric complex used in this invention is composed of ferric ion and either EDTA or PDTA, both well- known aminopolycarboxylic acid ligands. They can be used as free acids or as alkali metal or ammonium salts.
It is not necessary that the iron and the first and second aminopolycarboxylic acid ligands be present in the composition in stoichiometric proportion. It is preferred that the molar ratio of the each ligand to ferric iron be from 1:1 to 5:1. In a more preferred embodiment, the ratio is 2 to 3 moles of each complexing agent per mole of ferric ion.
The molar ratio of the first ferric complex to the second ferric complex is at least 2:1, and preferably it is at least 5:1, with a molar ratio of from 5:1 to 20:1 being more preferred. Even higher molar ratios may be useful also, such as up to 300:1.
Generally speaking the iron is present in from 2 to 25 grams per liter. Lower levels of 2 g/1 are commonly used to bleach color paper. Levels of 1025 g/1 are commonly used when rapid bleach action is desired. Levels of 13 g/1 are commonly used to bleach color reversal materials.
in a preferred.embodiment, a rehalogenating agent, such as chloride or bromide ions, is present in the composition. The rehalogenating agent can be present in any effective amount, with useful amounts typically being at least 0.1 mol/1, and preferably at least 0.20 mol/1. Bromide ions are preferred, especially when the emulsions being processed are predominantly silver bromide. Chloride or bromide ions can be used in the form of potassium, sodium or ammonium salts.
The bleaching composition can also include other addenda that may be useful in bleaching solutions, such as buffers, metal sequestering agents, anti-scumming agents, antioxidants and anti-foam agents.
Water-soluble aliphatic carboxylic acids as described in US-A-5,061,608 can be used in the bleaching composition of the present invention. One or more of these are used in sufficient amount to combat the undesirable increase in blue Dmin that results from bleach induced dye formation as set forth in the noted patent.
6 The bleaching compositions of this invention are aqueous acidic solutions preferably having a pH from 2.5 to 5.0, but a different pH can be used if desired. The pH can be maintained using suitable buffers. A preferred pH is in the range of from 3.5 to 4.5.
The compositions of this invention are bleaching compositions and not bleach-fix compositions, and thus they are substantially free of fixing agents or silver solvents.
The bleaching composition of this invention is especially useful in the color processing of photographic elements, including photographic films utilized in negative-positive processes or in color reversal processes and in the processing of color papers using separate bleaching and fixing steps. Useful color negative-positive processes include the steps of color developing, bleaching, fixing and stabilizing or washing. The steps of color reversal processes are well known. Bleaching is generally carried out in less than 6 minutes, but even shorter times may be possible under certain conditions.
The details of such processes including color developing solutions, fixing solutions, stabilizing solutions, conditioning solutions, first developer solutions (for reversal processes), and the COlor photographic elements processed therein, including emulsions, supports and other details thereof, are well known from hundreds of publications, some of which are 30 listed in Research Disclosure, publication 36544, pages 501541, September, 1994. Research Disclosure is a publication of Kenneth Mason Publications Ltd., Dudley House, 12 North Street, Emsworth, Hampshire P010 7DQ England. Preferred color photographic materials are color negative photographic films. It is generally convenient for the first and second ferric complex of the invention to be formed in
7 situ in the bleaching solution by reaction of a ferric salt, such as ferric sulfate or ferric nitrate, with the first and second aminopolycarboxylic acid ligands described herein.
While washing is not required, such as in mini-lab processing, in a preferred embodiment, a wash step is included in the processing method of this invention between the bleaching and fixing steps. Washing can be carried out using water or other conventional washing solutions. When washing is used, it is particularly desired that the washing rate in this step be up to 54,000 M1/M2 Of color photographic material processed. A preferred range of washing rates is from 10,000 to 35,000 M,/M2, and more preferably, from 5,000 to 20,000 M1/M2, and for these rates, it is preferred that the molar ratio of first ferric complex to the second ferric complex noted above if from 2:1 to 20:1. As more of the second ferric complex is used in the bleaching solution, the lower the washing rate that is used in the process.
The following example is provided to illustrate the present invention, but the invention is not to be interpreted as so limited. Unless otherwise indicated, percentages are by weight.
Example
Bleaching With Various Bleaching -o-lutions Samples of KODAK GOLD ULTRA" 400 Color Film were processed using conventional Process C-41 processing solutions and conditions except for the bleaching solutions, as described below.
All of the bleaching solutions were prepared so that the total ferric ion level was 6.67 g/1 (0.12 mol/1) and the first chelating ligand (either IDA or MIDA) was present at 0.30 mol/1 so the ferric ion to first ligand was 1:2.5. The solutions also included 8 acetic acid (50 ml/l) and potassium bromide (30 g/1), and had a pH of 4.0.
To each solution was added certain amounts (0.001, 0.01 or 0.05 mol/1) of second chelating ligand (either PDTA or EDTA) to provide various molar ratios of first ligand to second ligand (300:1, 30:1 and 6:1, respectively).
The Control A and B bleaching solutions contained ferric complexes with MIDA or IDA alone.
Rust (iron oxide) formation tests were carried out by adding a portion of the bleaching solution (5 ml) to 995 ml of tap water. These solutions were placed in a control temperature bath (38 OC) during the day, and is turned off at night to simulate a processor being turned on and off under normal conditions of use. The times (hours) required for rust formation are shown in FIG. 1. Rust formation was delayed the longest at a molar ratio of about 6:1 of first ferric complex to the second ferric complex.
Rust inhibition was best achieved with a combination of MIDA and EDTA in the bleaching solution. A combination of IDA and PDTA was better than a combination of IDA and EDTA.
Processing of the film samples using the various bleaching solutions was also carried out using conventional times and temperatures. The bleaching solution containing MIDA and PDTA was faster than with the solution containing MIDA and EDTA, especially when the molar ratio of first complex to second complex was about 6:1.
9
Claims (10)
1. An aqueous silver halide photographic bleach composition comprising a mixture of a first ferric aminopolycarboxylic acid complex and a second ferric aminopolycarboxylic acid complex, the bleach composition characterized wherein the first ferric aminopolycarboxylic acid complex being a ferric complex of a first aminopolycarboxylic acid 10 which is either iminodiacetic acid or an alkyliminodiacetic acid, the second ferric aminopolycarboxylic acid being a ferric complex of a second aminopolycarboxylic acid which is either ethylenediaminetetraacetic acid or propylenediaminetetraacetic acid, and the molar ratio of the first ferric aminopolycarboxylic acid complex to the second ferric aminopolycarboxylic acid complex being at least 2A.
2. The bleach composition as claimed in claim 1 wherein the molar ratio of the first ferric aminopolycarboxylic acid complex to the second ferric aminopolycarboxylic acid complex is fr6rr, 5:1 to 20:1.
3. The bleach composition as claimed in either of claims 1 and 2 wherein the first aminopolycarboxylic acid is iminodiacetic acid or methyliminodiacetic acid.
4. The bleach composition as claimed in any of claims 1 to 3 wherein the first aminopolycarboxylic acid is methyliminodiacetic acid, and the second aminopolycarboxylic acid is propylenediaminetetraacetic acid.
5. The bleach composition as claimed in any of claims 1 to 4 having a pH of from 2.5 to 5.0.
6. The bleach composition as claimed in any of claims 1 to 5 further comprising a rehalogenating agent.
7. A method of processing a color silver halide photographic material, the method comprising bleaching a color developed, color photographic material with the bleach composition as claimed in any 10 of claims 1 to 6.
8. The method as claimed in claim 7 wherein the color photographic material is a color negative photographic film.
9. The method as claimed in either of claims 7 or 8 further comprising a washing step between bleaching and fixing of the color photographic material.
10. The method as claimed in claim 9 wherein the rate of washing in the washing step is from 10,000 to 35,000 M1/M2 Of the color photographic material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US386395P | 1995-09-18 | 1995-09-18 | |
| US59505596A | 1996-02-01 | 1996-02-01 | |
| US08/666,173 US5693456A (en) | 1996-02-01 | 1996-06-19 | Photographic bleaching compositions and method of photographic processing using mixture of ferric complexes |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9619295D0 GB9619295D0 (en) | 1996-10-30 |
| GB2305510A true GB2305510A (en) | 1997-04-09 |
| GB2305510B GB2305510B (en) | 1999-06-02 |
Family
ID=27357504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9619295A Expired - Fee Related GB2305510B (en) | 1995-09-18 | 1996-09-16 | Improved photographic bleaching compositions and method of photographic processing using mixture of ferric complexes |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE19637921A1 (en) |
| GB (1) | GB2305510B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337825A (en) * | 1998-05-27 | 1999-12-01 | Eastman Kodak Co | Method of photographic processing using spray wash after bleaching |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0501479A1 (en) * | 1991-02-28 | 1992-09-02 | Fuji Photo Film Co., Ltd. | Bleaching solution for processing a silver halide color photographic material and a processing method using the same |
| EP0534086A1 (en) * | 1991-07-26 | 1993-03-31 | Konica Corporation | Bleach solution for colour photographic process |
| EP0645674A2 (en) * | 1993-09-28 | 1995-03-29 | Eastman Kodak Company | Photographic processing solution containing ternary ferric-complex salts |
-
1996
- 1996-09-16 GB GB9619295A patent/GB2305510B/en not_active Expired - Fee Related
- 1996-09-17 DE DE1996137921 patent/DE19637921A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0501479A1 (en) * | 1991-02-28 | 1992-09-02 | Fuji Photo Film Co., Ltd. | Bleaching solution for processing a silver halide color photographic material and a processing method using the same |
| EP0534086A1 (en) * | 1991-07-26 | 1993-03-31 | Konica Corporation | Bleach solution for colour photographic process |
| EP0645674A2 (en) * | 1993-09-28 | 1995-03-29 | Eastman Kodak Company | Photographic processing solution containing ternary ferric-complex salts |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337825A (en) * | 1998-05-27 | 1999-12-01 | Eastman Kodak Co | Method of photographic processing using spray wash after bleaching |
| GB2337825B (en) * | 1998-05-27 | 2002-10-02 | Eastman Kodak Co | Method of photographic processing using spray wash after bleaching |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9619295D0 (en) | 1996-10-30 |
| DE19637921A1 (en) | 1997-03-20 |
| GB2305510B (en) | 1999-06-02 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20090916 |