EP0547084A1 - Silver image bleaching process. - Google Patents
Silver image bleaching process.Info
- Publication number
- EP0547084A1 EP0547084A1 EP91915056A EP91915056A EP0547084A1 EP 0547084 A1 EP0547084 A1 EP 0547084A1 EP 91915056 A EP91915056 A EP 91915056A EP 91915056 A EP91915056 A EP 91915056A EP 0547084 A1 EP0547084 A1 EP 0547084A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solution
- image
- silver
- silver image
- iodine
- 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
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 17
- 239000004332 silver Substances 0.000 title claims abstract description 17
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000004061 bleaching Methods 0.000 title claims abstract description 6
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims abstract description 12
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052740 iodine Inorganic materials 0.000 claims abstract description 10
- 239000011630 iodine Substances 0.000 claims abstract description 10
- 235000010323 ascorbic acid Nutrition 0.000 claims abstract description 6
- 229960005070 ascorbic acid Drugs 0.000 claims abstract description 6
- 239000011668 ascorbic acid Substances 0.000 claims abstract description 6
- 238000009792 diffusion process Methods 0.000 claims abstract description 3
- XMBWDFGMSWQBCA-UHFFFAOYSA-M iodide Chemical compound [I-] XMBWDFGMSWQBCA-UHFFFAOYSA-M 0.000 claims abstract description 3
- 238000012546 transfer Methods 0.000 claims abstract description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000012217 deletion Methods 0.000 claims description 4
- 230000037430 deletion Effects 0.000 claims description 4
- -1 sulphite ions Chemical class 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000004285 Potassium sulphite Substances 0.000 claims description 2
- BHZRJJOHZFYXTO-UHFFFAOYSA-L potassium sulfite Chemical compound [K+].[K+].[O-]S([O-])=O BHZRJJOHZFYXTO-UHFFFAOYSA-L 0.000 claims description 2
- 235000019252 potassium sulphite Nutrition 0.000 claims description 2
- 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 claims description 2
- 239000000243 solution Substances 0.000 claims 9
- 239000007864 aqueous solution Substances 0.000 claims 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 abstract description 2
- 150000003378 silver Chemical class 0.000 abstract 1
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 6
- 101001123530 Nicotiana tabacum Putrescine N-methyltransferase 3 Proteins 0.000 description 6
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 229930188620 butyrolactone Natural products 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 108010010803 Gelatin Proteins 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Inorganic materials [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 2
- JKFYKCYQEWQPTM-UHFFFAOYSA-N 2-azaniumyl-2-(4-fluorophenyl)acetate Chemical compound OC(=O)C(N)C1=CC=C(F)C=C1 JKFYKCYQEWQPTM-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 101100244387 Candida albicans (strain SC5314 / ATCC MYA-2876) PMT6 gene Proteins 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
- 101150024216 PMT3 gene Proteins 0.000 description 1
- 229910021612 Silver iodide Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910001516 alkali metal iodide Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229940045105 silver iodide Drugs 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000080 wetting agent Substances 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
- G03C11/00—Auxiliary processes in photography
- G03C11/04—Retouching
-
- 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
- G03C5/42—Reducing; Intensifying
Definitions
- This invention relates to a method of bleaching silver images and to solutions therefor.
- the photographic silver halide image forming process is well known. Sometimes it is desirable to retouch the silver image formed thereby and, specifically, it is sometimes desired to remove parts of the image such as unwanted spots. It is known, for example from British specification 2 107 889 that a thickened solution containing, for example, iodine and an iodide can achieve the desired result. A problem with this approach is that a brown stain is produced which is unsightly. In addition the compositions of 2 107 889 are only suitable for printing plates which do not have any gelatin layers. It is therefore desirable to be able to delete the silver image without causing any stain and to delete the silver image in a gelatin- containing layer.
- the present invention provides a method of removing silver images without causing any stain.
- a method for bleaching a silver image wherein the image is treated with a first solution comprising iodine and an iodide salt and then the iodine stain is ..emoved by treating it with a second solution comprising ascorbic acid and sulphite ions.
- the image is bleached rapidly and permanently, there is no stain and the solutions have a long life.
- the silver image to be treated may be on an imagewise exposed and fully processed photographic film or paper or on a printing plate made by the photographic silver salt diffusion transfer process. Such materials are described in Research Disclosure Item 308119, December 1989 published by Kenneth Mason Publications, Emsworth, Hants, United Kingdom.
- the solutions are applied to the silver image using "felt tipped" pens, preferably ones with a fine tip to ensure accurate application.
- the first solution, used to delete the silver image preferably contains a mixture of water and butyrolactone.
- the ratio of aqueous to organic solvent is optimised to provide sufficient water for rapid penetration of the solute into the gelatin layer on the image-bearing material, together with sufficient butyrolactone to obtain high complexing power for silver iodide so that the image is removed in a conveniently quick time.
- the first may also contain other solvents used alone or in combination including alcohols eg ethyl or butyl alcohol.
- the iodide may be provided by an ammonium or alkali metal iodide, eg sodium or potassium iodide.
- the first solution preferably contains from 2 to 50g, especially from 20g to 45g, of iodine and from 50g to 250 g, especially from 150g to 200g, of iodide ions per litre.
- the solvent preferably comprises from 10 to 60% by weight of water, the exact figures being dependent on the considerations outlined above.
- the first solution also contains a wetting agent and an acid.
- the second solution preferably contains from 10 to lOOg, especially from 40 to 80g, ascorbic acid and from 10 to lOOg, especially from 30 to 70g, of potasium sulphite per litre.
- the solution is preferably aqueous.
- the invention further provides a deletion fluid kit comprising the first and second solutions as defined above.
- the solutions are each contained in a felt tip pen.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
Procédé de blanchiment d'une image argentique, selon lequel on trite l'image avec une première solution contenant de l'iode et un sel d'iodure, puis on enlève la tache d'iode en la traitant avec une seconde solution contenant de l'acide ascorbique et des ions de sulfite. Ce procédé est tout particulièrement adapté aux images argentiques formées par le processus de diffusion par transfert de sels d'argent.Process for bleaching a silver image, according to which the image is treated with a first solution containing iodine and an iodide salt, then the iodine stain is removed by treating it with a second solution containing ascorbic acid and sulfite ions. This process is particularly suitable for silver images formed by the process of diffusion by transfer of silver salts.
Description
SILVER IMAGE BLEACHING PROCESS
This invention relates to a method of bleaching silver images and to solutions therefor. The photographic silver halide image forming process is well known. Sometimes it is desirable to retouch the silver image formed thereby and, specifically, it is sometimes desired to remove parts of the image such as unwanted spots. It is known, for example from British specification 2 107 889 that a thickened solution containing, for example, iodine and an iodide can achieve the desired result. A problem with this approach is that a brown stain is produced which is unsightly. In addition the compositions of 2 107 889 are only suitable for printing plates which do not have any gelatin layers. It is therefore desirable to be able to delete the silver image without causing any stain and to delete the silver image in a gelatin- containing layer.
The present invention provides a method of removing silver images without causing any stain. According to the present invention there is provided a method for bleaching a silver image wherein the image is treated with a first solution comprising iodine and an iodide salt and then the iodine stain is ..emoved by treating it with a second solution comprising ascorbic acid and sulphite ions.
The image is bleached rapidly and permanently, there is no stain and the solutions have a long life. The silver image to be treated may be on an imagewise exposed and fully processed photographic film or paper or on a printing plate made by the photographic silver salt diffusion transfer process. Such materials are described in Research Disclosure
Item 308119, December 1989 published by Kenneth Mason Publications, Emsworth, Hants, United Kingdom.
In a preferred embodiment of the present invention the solutions are applied to the silver image using "felt tipped" pens, preferably ones with a fine tip to ensure accurate application.
The first solution, used to delete the silver image preferably contains a mixture of water and butyrolactone. The ratio of aqueous to organic solvent is optimised to provide sufficient water for rapid penetration of the solute into the gelatin layer on the image-bearing material, together with sufficient butyrolactone to obtain high complexing power for silver iodide so that the image is removed in a conveniently quick time. The first may also contain other solvents used alone or in combination including alcohols eg ethyl or butyl alcohol.
The iodide may be provided by an ammonium or alkali metal iodide, eg sodium or potassium iodide. The first solution preferably contains from 2 to 50g, especially from 20g to 45g, of iodine and from 50g to 250 g, especially from 150g to 200g, of iodide ions per litre. The solvent preferably comprises from 10 to 60% by weight of water, the exact figures being dependent on the considerations outlined above.
Preferably the first solution also contains a wetting agent and an acid.
The second solution preferably contains from 10 to lOOg, especially from 40 to 80g, ascorbic acid and from 10 to lOOg, especially from 30 to 70g, of potasium sulphite per litre. The solution is preferably aqueous.
The invention further provides a deletion fluid kit comprising the first and second solutions as
defined above. Preferably the solutions are each contained in a felt tip pen.
The following Example is included for a better understanding of the invention. The words KODAK and PMT are trademarks.
EXAMPLE
The following solutions were made up:
SOLUTION A
Iodine 26 g
Potassium iodide 170 g
ETHOQUAD C25 (surfactant) 1 g
Butyrolactone 510 g Water 270 g
Acetic acid 18 g
SOLUTION B
Ascorbic acid 60 g Potassium sulphite 50 g
Water 1 litre
Each solution was filled into a felt tip pen.
Images were produced using Kodak PMT3 KNP negative paper, exposed on a Kodak Imagemaker Camera and processed in a Kodak 43DT Imagemate Processor onto a variety of Kodak PMT receivers. Images were deleted successfully from the following receivers in an average time of 20 secc"ds.
PMT 3 KRPM Matt receiver paper
PMT 3 KRPT Thin receiver paper
PMT 3 KRPTA Adhesive thin receiver paper PMT 3 KRPG Glossy receiver paper
PMT 3 KRF Receiver film
PMT 3 KRFT Thin receiver film PMT II Metal litho plates
Other materials tried were Kodak PMT II Paper Litho plates and Kodak Pagiset Phototypesetting paper. Images could be successfully deleted from both, but the deletion time was greater than 1 minute.
Claims
CLAIMS :
1. A method for bleaching a silver image wherein the image is treated with a first solution comprising iodine and an iodide salt and then the iodine stain is removed by treating it with a second solution comprising ascorbic acid and sulphite ions.
2. A method as claimed in claim 1 in which the silver image to be treated is located on an imagewise exposed and fully processed photographic film or paper or on a printing plate made by the photographic silver salt diffusion transfer process.
3. A method as claimed in Claim 1 or 2 in which the solutions are applied to the silver image using felt tipped pens. . A method as claimed in any of claims 1 - 3 in which the first solution contains from 2 to 50g, preferably from 20g to 45g, of iodine per litre.
5. A method as claimed in any of claims 1 - 4 in which the first solution contains from 50 to 250 g, preferably from 150g to 200g, of potassium iodide per litre.
6. A method as claimed in any of claims 1 - 5 in which the solvent of the first solution comprises from 10 to 60% by weight of water.
7. A method as claimed in any of claims 1 - 6 in which the second solution comprises an aqueous solution containing from 10 to lOOg, preferably from 40 to 80g, ascorbic acid and from 10 to lOOg, preferably from 30 to 70g, of potassium sulphite per litre.
8. A deletion fluid kit comprising the first and second solutions as defined in any of claims 1 - 2 and 4 - 7.
9. A deletion fluid kit as claimed in claim 8 in which the solutions are each contained in a felt tip pen.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9019604 | 1990-09-07 | ||
| GB909019604A GB9019604D0 (en) | 1990-09-07 | 1990-09-07 | Silver image bleaching process |
| PCT/EP1991/001659 WO1992004659A1 (en) | 1990-09-07 | 1991-09-03 | Silver image bleaching process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0547084A1 true EP0547084A1 (en) | 1993-06-23 |
| EP0547084B1 EP0547084B1 (en) | 1994-08-10 |
Family
ID=10681852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91915056A Expired - Lifetime EP0547084B1 (en) | 1990-09-07 | 1991-09-03 | Silver image bleaching process |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0547084B1 (en) |
| JP (1) | JPH06500865A (en) |
| DE (1) | DE69103424T2 (en) |
| GB (1) | GB9019604D0 (en) |
| WO (1) | WO1992004659A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9118042D0 (en) * | 1991-08-21 | 1991-10-09 | Kodak Ltd | Silver image bleaching solution and process |
| FR2807171A1 (en) * | 2000-03-30 | 2001-10-05 | Denise Marie Claude Tennerel | Production of picture, by partial removal of color in layers from cut-out pieces of photographs assembled in collage or mosaic |
| EP1431418A1 (en) * | 2002-12-19 | 2004-06-23 | Wieland Dental + Technik GmbH & Co. KG | Process for removing conductive silver from electrodeposited parts |
| US9364415B2 (en) * | 2014-03-14 | 2016-06-14 | Basil Michaels | Ascorbic acid-based iodine stain remover and method of use |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE590919C (en) * | 1931-10-28 | 1934-01-12 | I G Farbenindustrie Akt Ges | Process for the production of optically transparent silver images |
| US2108261A (en) * | 1934-09-19 | 1938-02-15 | Paul H Jamieson | Method of pictorial control and material for use therein |
| US2141354A (en) * | 1937-04-23 | 1938-12-27 | Cinecolor Inc | Method of treating photographic film |
| US2206190A (en) * | 1937-09-27 | 1940-07-02 | Paul H Jamieson | Method of pictorial control and material for use therein |
| US3423441A (en) * | 1965-07-24 | 1969-01-21 | Daiichi Yakuhin Sangyo Kk | Process for preparation of iodinated lecithin |
| BE1002506A6 (en) * | 1988-09-05 | 1991-03-05 | Drukinkten Arets Bv Met Beperk | Correction technique for photographic emulsions |
-
1990
- 1990-09-07 GB GB909019604A patent/GB9019604D0/en active Pending
-
1991
- 1991-09-03 JP JP3514331A patent/JPH06500865A/en active Pending
- 1991-09-03 EP EP91915056A patent/EP0547084B1/en not_active Expired - Lifetime
- 1991-09-03 DE DE69103424T patent/DE69103424T2/en not_active Expired - Fee Related
- 1991-09-03 WO PCT/EP1991/001659 patent/WO1992004659A1/en not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9204659A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0547084B1 (en) | 1994-08-10 |
| WO1992004659A1 (en) | 1992-03-19 |
| JPH06500865A (en) | 1994-01-27 |
| DE69103424T2 (en) | 1995-03-30 |
| GB9019604D0 (en) | 1990-10-24 |
| DE69103424D1 (en) | 1994-09-15 |
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