US2943935A - Stabilization of photographic bleach powders containing an alkali metal ferricyanide - Google Patents
Stabilization of photographic bleach powders containing an alkali metal ferricyanide Download PDFInfo
- Publication number
- US2943935A US2943935A US659213A US65921357A US2943935A US 2943935 A US2943935 A US 2943935A US 659213 A US659213 A US 659213A US 65921357 A US65921357 A US 65921357A US 2943935 A US2943935 A US 2943935A
- Authority
- US
- United States
- Prior art keywords
- alkali metal
- bleach
- parts
- ferricyanide
- weight
- 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
Links
- 239000007844 bleaching agent Substances 0.000 title claims description 43
- 239000000843 powder Substances 0.000 title claims description 23
- 229910052783 alkali metal Inorganic materials 0.000 title claims description 20
- -1 alkali metal ferricyanide Chemical class 0.000 title description 12
- 230000006641 stabilisation Effects 0.000 title description 2
- 238000011105 stabilization Methods 0.000 title description 2
- 239000000203 mixture Substances 0.000 claims description 36
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 19
- YAGKRVSRTSUGEY-UHFFFAOYSA-N ferricyanide Chemical compound [Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] YAGKRVSRTSUGEY-UHFFFAOYSA-N 0.000 claims description 13
- 150000001340 alkali metals Chemical class 0.000 claims description 10
- 229910001513 alkali metal bromide Inorganic materials 0.000 claims description 8
- UETZVSHORCDDTH-UHFFFAOYSA-N iron(2+);hexacyanide Chemical compound [Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] UETZVSHORCDDTH-UHFFFAOYSA-N 0.000 claims 1
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 14
- 239000000243 solution Substances 0.000 description 12
- 239000003513 alkali Substances 0.000 description 11
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 10
- 239000004615 ingredient Substances 0.000 description 9
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 8
- 150000008064 anhydrides Chemical class 0.000 description 6
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 5
- 229910052700 potassium Inorganic materials 0.000 description 5
- 239000011591 potassium Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229940100603 hydrogen cyanide Drugs 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000001488 sodium phosphate Substances 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 231100000331 toxic Toxicity 0.000 description 4
- 230000002588 toxic effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 3
- 229910000318 alkali metal phosphate Inorganic materials 0.000 description 3
- 238000004061 bleaching Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 230000033116 oxidation-reduction process Effects 0.000 description 3
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 2
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 229910000397 disodium phosphate Inorganic materials 0.000 description 2
- 235000019800 disodium phosphate Nutrition 0.000 description 2
- 238000011534 incubation Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 2
- 235000019799 monosodium phosphate Nutrition 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000000276 potassium ferrocyanide Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- XOGGUFAVLNCTRS-UHFFFAOYSA-N tetrapotassium;iron(2+);hexacyanide Chemical compound [K+].[K+].[K+].[K+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] XOGGUFAVLNCTRS-UHFFFAOYSA-N 0.000 description 2
- PXRKCOCTEMYUEG-UHFFFAOYSA-N 5-aminoisoindole-1,3-dione Chemical compound NC1=CC=C2C(=O)NC(=O)C2=C1 PXRKCOCTEMYUEG-UHFFFAOYSA-N 0.000 description 1
- 241001233887 Ania Species 0.000 description 1
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 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 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229940116024 aftera Drugs 0.000 description 1
- 229910001514 alkali metal chloride Inorganic materials 0.000 description 1
- 229910001508 alkali metal halide Inorganic materials 0.000 description 1
- 150000008045 alkali metal halides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 210000000941 bile Anatomy 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical compound [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229960003351 prussian blue Drugs 0.000 description 1
- 239000013225 prussian blue Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 235000011083 sodium citrates Nutrition 0.000 description 1
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- BYGOPQKDHGXNCD-UHFFFAOYSA-N tripotassium;iron(3+);hexacyanide Chemical compound [K+].[K+].[K+].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] BYGOPQKDHGXNCD-UHFFFAOYSA-N 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
- 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
- the present invention relates to single powder photographic bleach mixtures containing an alkali metal ferricyanide as the oxidizing agent, and more particularly to the stabilization of such bleach powders.
- aqueous solution an alkali metal fern'cyanide such as lithium, potassium or sodium terricyanide as the oxidizing agent which converts the metallic silver formed during development into a silver salt which is soluble in silver halide solvents such as hypo.
- a bleach solution contains, in addition to the ferricyanide, a halogenizing or converting agent preferably an alkali metal chloride or an alkali metal bromide which converts the silver ferricyanide initially formed in the bleaching reaction into the less soluble silver chloride or silver bromide and thus impels the bleach reaction to completion.
- the ferricyanide bleach solutions contain a bufiering agent which maintains the desired pH even though small amounts of acids or alkali may be carried into the bleach by the film.
- the pH of the bleach solutions falls between a range of from 3 to 9, a pH between 4' and 6 being generally preferred.
- alkali metal phosphates such as disodium and monosodium phosphate, sodium citrate, sodium bisulfate, citric acid or phthalic acid.
- Some of the ingredients of the butter mixture act also as corrosion inhibitors and retard the corrosive action of the ferricyanide bleach on metallic developing tanks, trays and the like.
- the alkali metal ferricyanide bleaches are usually packaged and sold as dry powder mixtures. Normally, the stability of dry ferricyanide bleach mixtures leaves much to'be desired. However, their stability is further drastically curtailed by the presence of other ingredients which are added to ensure thatthe bleach possesses certain desirable photographic characteristics.
- a metal ferrocyanide is included which gives a tempering action to a freshly mixed bleach solution in order to simulate the performance of a partially used bleach.
- the rate of bleaching depends on the 7 oxidation reduction potential which in turnis a function of pH and the relative"ferrocyanide-fenicyanide concentration. No such oxidation reduction potential can be established so long as ferricyanide only is in the fresh solution, and no ferrocyanide has been formed as a result of the bleaching action;
- the desired tempering action is achieved by adding to a fresh bleach solution specified amounts of ferrocyanide thus establishing an oxidation reduction potential which otherwise would be set up only after part of the ferricyanide had been reduced to ferrocyanide.
- ferricyanide has an even greater tendency to cause caking and discoloration. It is believed that this discoloration is caused by the de- Patented July 5, 1960 2 composition of ferricyanide yielding ferrocyanide and iron salts leading in all likelihood to the formation of Prussian Blue or Turnbulls Blue.
- a gas is formed which creates a pressure'build-up in hermetically sealed packages. This gas has been identified as hydrogen cyanide which is highly toxic. 'Thus, the decomposition of ferricyanide bleach powders creates a serious health hazard.
- ferricyanide bleaching powder ingredients which afiect adversely the stability of the ferricyanide bleaching powder are alkali dichromates which are added to bleach solutions to inhibit the corrosion of processing equipment. Ferricyanide bleaches containing dichromates also cake and discolor with the formation of hydrogen cyanide.
- boric anhydride is an etiective stabilizer for photographic bleaches particularly those which contain, in addition to the alkali metal ferricyanide, a small amount of alkali ferrocyanide or alkali dichromate.
- Photogaphic bleach mixtures containing alkali metal ferricyanide as the oxidizing agent and stabilized with boric anhydride constitute the purposes and objects of the present invention.
- the photographic bleach powders which are contentplated herein contain as their essential ingredients an alkali metal ferricyanide and boric anhydride, together with other bleach adjuvants including buir'er mixtures, alkali metal halides, particularly alkali metal bromides andalkali metal ferrocyanides or alkali metal dichromates; Photographic bleach powders which we have found stable during storage for considerable periods of time may be compounded in the following proportions, it being understood that all parts are by weight and'that the resulting dry powder is to be used to make a liter of bleach solution:
- boric anhydride In compounding the above bleach powder, one may proceed by mixing the boric anhydride to the alkali metal ferricyanide and adding the other ingredients later; However, if preferred, all the ingredients may be admixed simultaneously.
- One of the most important advantages of boric anhydride lies in the fact that its stabilizing action is not impaired by changes in alkalinity and acidlty.
- the stabilizing action is not based on a dehydrating action and is not influenced by the selection of bleach ingredients with ditferent amounts of water of crystallization. While it is desirable to use a grade of boric anhydride which is completely free of water, it must be kept in mind that small amounts of moisture are absorbed by the anhydride during storage and before the mixing of the bleach. However, these small amounts of water absorbed which usually do not exceed 2 percent, but which may go up as high as 5 percent based on the weight of boric anhydride, do not interfere with the stabilizing action on the bleach powder.
- Example IV This powder mixture did not deteriorate after storage for "6 months at an average room temperature of 75 F.
- V l h is powder mixture 'was kept for 6 months at room temperaturewithout deterioration. "A mixture without boric anhydride caked badly' after a few days and discolored to a deep blue 'color with the-formation of hydrogen eyaziide gas.
- Example V1 r w Grams Potasium ferricyanide 75.0 Potassium ferrocyamde 5 .0 Sodium bromide. '2;. 1020 weightofan"alkalizmetal rlichroniate, theflpartsfbeiag from 2 to 12 parts by weight of alkali metal ferrocyanide,-
- a stable single powder photographic bleach ture containing as its essential ingredient-stolthe preparation of onelliter of bleach solution: from 30 to 120 parts by weight of alkalimetal ferricyanitle; from 2 to 20. parts 'by weight of alkali metal bromide; from 5 to 30 parts by weight of a butter-mixture comprising a salt selected from the group-consisting :of alkali metal phosphates and alkali :metal 'citr'ates, and an acid :selected from the. group 'consistingzof citric and phthalic acid; g
- a stable'sin'gleipowder photographic bleach mixture comprising an alkali metal fenicyanidq an alkali m'etal ferrocyanide, ania'lkalianetal bromide and 'a-stabiliiing' amount of boric 'anhydride inaS quantity sufficient to prevent 'cakingfand disodlorationbf said bleach mixture;
- a stable photographic bleach mixture having the following composition:
- a stable photographic bleach mixture having the following composition:
- a stable photographic bleach mixture having the following composition:
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Detergent Compositions (AREA)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE567236D BE567236A (en(2012)) | 1957-05-15 | ||
| US659213A US2943935A (en) | 1957-05-15 | 1957-05-15 | Stabilization of photographic bleach powders containing an alkali metal ferricyanide |
| DEG24469A DE1062114B (de) | 1957-05-15 | 1958-05-06 | Stabiles photographisches Bleichmittel |
| GB14652/58A GB834972A (en) | 1957-05-15 | 1958-05-07 | Stabilization of photographic bleach powders containing an alkali metal ferricyanide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US659213A US2943935A (en) | 1957-05-15 | 1957-05-15 | Stabilization of photographic bleach powders containing an alkali metal ferricyanide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2943935A true US2943935A (en) | 1960-07-05 |
Family
ID=24644524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US659213A Expired - Lifetime US2943935A (en) | 1957-05-15 | 1957-05-15 | Stabilization of photographic bleach powders containing an alkali metal ferricyanide |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2943935A (en(2012)) |
| BE (1) | BE567236A (en(2012)) |
| DE (1) | DE1062114B (en(2012)) |
| GB (1) | GB834972A (en(2012)) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3271153A (en) * | 1963-01-18 | 1966-09-06 | Eastman Kodak Co | Photographic processing baths for stabilization processing |
| US3342598A (en) * | 1965-06-14 | 1967-09-19 | Eastman Kodak Co | Phosphorous and maleic acid buffers for ferricyanide photographic bleaches |
| US4125402A (en) * | 1976-08-19 | 1978-11-14 | Ciba-Geigy Ag | Method of processing silver dye bleaching materials and preparations suitable for the dye and silver bleaching |
| EP1403705A3 (en) * | 2002-09-27 | 2004-04-21 | Eastman Kodak Company | Odorless photographic bleaching composition and color photographic processing |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3335004A (en) * | 1963-12-09 | 1967-08-08 | Eastman Kodak Co | Method for stabilization processing of color emulsions |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1656235A (en) * | 1926-05-06 | 1928-01-17 | Firm E Taeschner Chemisch Phar | Process for reducing photographic silver image layers |
| US2606118A (en) * | 1951-02-09 | 1952-08-05 | Eastman Kodak Co | Stabilizing agent for single powder photographic developers |
| US2611699A (en) * | 1949-12-30 | 1952-09-23 | Gen Aniline & Film Corp | Regeneration of exhausted silver bleaching solutions |
| US2650878A (en) * | 1949-12-09 | 1953-09-01 | Du Pont | Method of producing etched printing plates |
| US2843482A (en) * | 1956-03-30 | 1958-07-15 | Eastman Kodak Co | Photographic bleach composition |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE201168C (en(2012)) * | ||||
| DE222901C (en(2012)) * | ||||
| FR724863A (fr) * | 1930-12-31 | 1932-05-04 | Union Chimique Belge Sa | Renforçateur pour la photographie |
| GB507152A (en) * | 1937-12-09 | 1939-06-09 | Bela Gaspar | Light-sensitive multilayer photographic material |
| USRE22977E (en) * | 1945-11-08 | 1948-02-24 | Bleaching bath and process for | |
| US2518686A (en) * | 1945-11-08 | 1950-08-15 | Gen Aniline & Film Corp | Aldehyde antistain baths for developed color photographic material |
| US2551091A (en) * | 1949-09-14 | 1951-05-01 | Du Pont | Process for color developing, including treatment with a quaternary ammonium salt |
| BE500365A (en(2012)) * | 1949-12-30 | |||
| BE519734A (en(2012)) * | 1952-05-07 |
-
0
- BE BE567236D patent/BE567236A/xx unknown
-
1957
- 1957-05-15 US US659213A patent/US2943935A/en not_active Expired - Lifetime
-
1958
- 1958-05-06 DE DEG24469A patent/DE1062114B/de active Pending
- 1958-05-07 GB GB14652/58A patent/GB834972A/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1656235A (en) * | 1926-05-06 | 1928-01-17 | Firm E Taeschner Chemisch Phar | Process for reducing photographic silver image layers |
| US2650878A (en) * | 1949-12-09 | 1953-09-01 | Du Pont | Method of producing etched printing plates |
| US2611699A (en) * | 1949-12-30 | 1952-09-23 | Gen Aniline & Film Corp | Regeneration of exhausted silver bleaching solutions |
| US2606118A (en) * | 1951-02-09 | 1952-08-05 | Eastman Kodak Co | Stabilizing agent for single powder photographic developers |
| US2843482A (en) * | 1956-03-30 | 1958-07-15 | Eastman Kodak Co | Photographic bleach composition |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3271153A (en) * | 1963-01-18 | 1966-09-06 | Eastman Kodak Co | Photographic processing baths for stabilization processing |
| US3342598A (en) * | 1965-06-14 | 1967-09-19 | Eastman Kodak Co | Phosphorous and maleic acid buffers for ferricyanide photographic bleaches |
| US4125402A (en) * | 1976-08-19 | 1978-11-14 | Ciba-Geigy Ag | Method of processing silver dye bleaching materials and preparations suitable for the dye and silver bleaching |
| EP1403705A3 (en) * | 2002-09-27 | 2004-04-21 | Eastman Kodak Company | Odorless photographic bleaching composition and color photographic processing |
| US20040086810A1 (en) * | 2002-09-27 | 2004-05-06 | Haye Shirleyanne E. | Odorless photographic bleaching composition and color photographic processing |
| US6828084B2 (en) | 2002-09-27 | 2004-12-07 | Eastman Kodak Company | Odorless photographic bleaching composition and color photographic processing |
Also Published As
| Publication number | Publication date |
|---|---|
| BE567236A (en(2012)) | |
| GB834972A (en) | 1960-05-18 |
| DE1062114B (de) | 1959-07-23 |
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