US3620744A - Dyestuff-bleaching preparation for the photographic silver dyestuff-bleaching process - Google Patents
Dyestuff-bleaching preparation for the photographic silver dyestuff-bleaching process Download PDFInfo
- Publication number
- US3620744A US3620744A US834445A US3620744DA US3620744A US 3620744 A US3620744 A US 3620744A US 834445 A US834445 A US 834445A US 3620744D A US3620744D A US 3620744DA US 3620744 A US3620744 A US 3620744A
- Authority
- US
- United States
- Prior art keywords
- bleaching
- dyestuff
- acid
- iodide
- bath
- 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
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials
Definitions
- a dyestuff-bleaching preparation which contains an acid, a water-soluble iodide, optionally a dyestuffbleaching catalyst and in addition a reductone such as ascorbic acid.
- a dyestuff-bleaching preparation which contains an acid, a water-soluble iodide, optionally a dyestuffbleaching catalyst and in addition a reductone such as ascorbic acid.
- the present invention relates to dyestuff-bleaching preparations for the treatment of photographic material according to the silver dyestuff-bleaching process.
- these colorbleaching preparations are in the form of baths.
- the known dyestuff-bleaching baths for this process generally consist of an acid such as, for example, hydrochloric acid, a complex-forming agent such as, for example, thiourea and optionally a color-bleaching catalyst such as, for example, 2,3-diaminophenazine.
- an acid such as, for example, hydrochloric acid
- a complex-forming agent such as, for example, thiourea
- a color-bleaching catalyst such as, for example, 2,3-diaminophenazine.
- the present invention therefore, relates to a dyestuffbleaching bath which does not possess the above disadvantages.
- the present invention thus provides a dyestuff-bleaching preparation for the photographic silver dyestuff-bleaching process which contains an acid, a water-soluble iodide, optionally a dyestuff-bleaching catalyst, and a reductone.
- Suitable acids are, for example, sodium hydrogen sulfate, sulfamic acid, acetic acid, citric acid, organic sulfonic acid or especially strong acids, for example, hydrochloric acid or sulfuric acid.
- the water-soluble iodide can be, for example, potassium iodide, sodium iodide, ammonium iodide or hydriodic acid.
- the dyestuff-bleaching catalyst can either be dissolved in the color-bleaching preparation or be contained in the photographic material to be bleached and can be, for example, a pyrazine, a quinoxaline or a phenazine.
- aci-reductones are preferred.
- aci-reductones are also cyclic or acyclic compounds which contain a 3-carbonyl-endiol-(l ,2) grouping offormula (2) m
- Suitable reductones are, for example reductinic acid, triose reductone, 3-hydroxy-5-phenyltetrone-acid, 3-hydroxy-5- phenyl-tetronimide, 5-o-chlorophenyl-3-hydroxy-tetronimide, isoascorbic acid and preferably ascorbic acid, or mixtures of these reductones.
- the reductone to be employed should be appropriately so chosen that the normal potential or reductone/dehydro-reductone is more negative under the conditions chosen than the normal potential iodine/iodide.
- the effective potentials can also be varied by changing the quantity ratios.
- the dyestuff-bleaching preparation should, at a pH-value of 1, contain a reductone which has a normal potential reductone/dehydroreductone of less than 500 mv.
- the dyestuff-bleaching preparation can, apart from being in the form of a bath, for example also be in the form of a gellike thickener, in the form of a colloidal composition or of a photographic layer.
- the dyestuff-bleaching preparations can be introduced into a photographic material in such a way that the dyestuff-bleaching action can only develop on processing the photographic material.
- Special cases mix tures of iodides and reductones as such can also be present, whilst the acid and the dyestuff-bleaching catalyst are accommodated in another phase (compare for example French Patent Specification 1,504,238
- the color-bleaching baths can, in addition to the constituents mentioned, contain one or more usual additives, for example, complex-forming agents, wetting agents and solvents
- additives for example, complex-forming agents, wetting agents and solvents
- EXAMPLE 1 A silver bromide emulsion dyed with a dyestuff of formula H 8 SO H OCH;
- Stop bath 1 minute: g. of crystalline sodium acetate, g. of glacial acetic acid, and water to make up to 1 liter.
- Dyestuff bleaching 8 minutes: 500 ml. of water, 27 ml. of sulfuric acid (96 percent strength), 0.2 g. of ascorbic acid, 20 ml. of a mixture of benzyl alcohol (40 percent), diethylene glycol (40 percent and water (20 percent) 10 mg. of 6- benzoylamino-Z,3-dimethyl-quinoxaline, 10 g. of potassium iodide and water to make up to 1 litre.
- Silver bleaching 6 minutes: 500 ml. of water, 27 ml. of sulfuric acid (96 percent strength), 20 g. of crystalline copper sulfate, 60 g. of potassium bromide and water to make up to 1 liter.
- Silver bleaching 6 minutes: 500 ml. of water, 27 ml. of sulfuric acid (96 percent strength), 20 g. of crystalline copper sulfate, 60 g. of potassium bromide and water to make up to 1 liter.
- EXAMPLE 2 The procedure of example i is followed but a color bleaching bath is used which instead of the ascorbic acid contains l g./1. of triose-reductone.
- the triose-reductone is obtained by reacting lead reductonate (according to Euler- Eistert, Chemistry and Biochemistry of the Reductones and Reductonates, Verlag Enke, Stuttgart 1957, page 53) with sulfuric acid and separating off the lead sulfate formed.
- EXAMPLE 7 The procedure of example I is used but the following dyestuff-bleaching bath employed: 60 g. of p-toluenesulfonic acid, 1 g. of ascorbic acid, 10 mg. of phenazine, l5 g. of ammonium iodide and water to make up to l liter.
- EXAMPLE 8 The procedure of example 1 is followed but the following dyestuff-bleaching bath is used: 60 g. of sulfamic acid, I g. of ascorbic acid, 50 mg. of 2,5-dimethylpyrazine, l7 g. of potassium iodide and water to make up to 1 liter.
- EXAMPLE 9 The procedure of example 1 is used, but the treatment is carried out for l2 minutes in a dyestuff-bleaching bath of the following composition: 5 g. of sodium acetate, 10 ml. of glacial acetic acid, 1 g. of ascorbic acid, 200 mg. of 2,3-dimethyl-6- methoxyquinoxaline, l60 g. of potassium iodide and water to make up to 1 liter.
- the same result is obtained as when using it after 4 days standing in air.
- the dyestuff is completely bleached behind the lightest wedge step.
- the dyestuffbleaching bath is made up without ascorbic acid, various results depending on the age of the solution are obtained. After 4 days standing in air, the dyestuff can no longer be completely bleached.
- a similar result is obtained if instead of the acetic acid-acetate combination a citric acid citrate combination is used.
- a photographic material with three color layers has a gelatine layer containing the dyestuff-bleaching catalyst 2,3- diphenyl-6-aminoquinoxaline deposited on a carrier, a redsensitive silver bromide emulsion containing the bluish-green dyestuff of formula on top of this, and a green-sensitive silver bromide emulsion containing the purple dyestuff of formula:
- This copying material is exposed behind a step wedge and processed in accordance with example 1.
- the following bath is however used for dyestuff bleaching: 27 ml of sulfuric acid (96 percent strength), 0.5 g. of ascorbic acid, 25 g. of potassium iodide and water to make up to 1 liter
- a positive image of the step wedge is obtained in this manner, in which all three dyestuffs are completely bleached behind the lightest wedge step.
- This dyestuff-bleaching bath is used after 4 days standing.
- Dyestufl bleaching bath with ascorbic acid fresh and dyestufl bleaching bath with ascorbic acid, 4 days old.
- a dyestuff-bleaching preparation for the photographic silver dyestuff-bleaching process containing an acid, a water' soluble iodide, a reductone, and a dyestuff-bleaching catalyst, said reductone being selected from the group consisting of reductinic acid, triose reductone, ascorbic acid, isoascorbic acid, 3-hydroxy-5-phenyl-tetronic acid, 3-hydroxy-5-phenyl tetronimide, and 5-o-chloro-phenyl-3-hydroxy-tetronimide, said dyestuff bleaching catalyst being selected from the group consisting of a pyrazine, a quinoxaline and a phenazine.
- a preparation according to claim 1 being in the form of a dyestuff-bleaching bath.
- a preparation according to claim 1 containing as acid a member selected from the group consisting of an organic sulfonic acid, sodium bisulfate, hydrochloric acid, sulfuric acid, acetic acid and citric acid.
- a preparation according to claim 1 containing as watersoluble iodide hydriodic acid, ammonium iodide, sodium iodide and potassium iodide.
- a preparation according to claim 1 containing sulfuric acid, potassium iodide and ascorbic acid.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH940468A CH508899A (de) | 1968-06-25 | 1968-06-25 | Farbbleichzubereitung für das photographische Silberfarbbleichverfahren |
Publications (1)
Publication Number | Publication Date |
---|---|
US3620744A true US3620744A (en) | 1971-11-16 |
Family
ID=4351634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US834445A Expired - Lifetime US3620744A (en) | 1968-06-25 | 1969-06-18 | Dyestuff-bleaching preparation for the photographic silver dyestuff-bleaching process |
Country Status (9)
Country | Link |
---|---|
US (1) | US3620744A (de) |
AT (1) | AT288160B (de) |
BE (1) | BE735081A (de) |
CH (1) | CH508899A (de) |
DE (1) | DE1924723A1 (de) |
FR (1) | FR2011649A1 (de) |
GB (1) | GB1255857A (de) |
NL (1) | NL6909656A (de) |
SE (1) | SE359170B (de) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3961957A (en) * | 1973-05-18 | 1976-06-08 | Ciba-Geigy Ag | Dye bleach preparation for the photographic silver dye bleach process |
US3963492A (en) * | 1973-10-12 | 1976-06-15 | Ciba-Geigy Ag | Method for processing silver dye bleach materials |
US4014698A (en) * | 1974-07-10 | 1977-03-29 | Ciba-Geigy Ag | Method for processing silver dye bleach materials |
US5017226A (en) * | 1988-10-03 | 1991-05-21 | A. B. Dick Company | Ink and method for the development of concealed images |
US5084434A (en) * | 1988-10-03 | 1992-01-28 | A.B. Dick Company | Ink and method for the development of concealed iamges |
EP0568953A2 (de) * | 1992-05-04 | 1993-11-10 | Eastman Kodak Company | Verfahren und Zusammensetzungen zum Retuschieren von Filmbildern |
US5895781A (en) * | 1997-12-22 | 1999-04-20 | S. C. Johnson & Son, Inc. | Cleaning compositions for ceramic and porcelain surfaces and related methods |
US6417226B1 (en) * | 2000-12-12 | 2002-07-09 | Nicholas V. Perricone | Skin whiteners containing hydroxytetronic acid |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE791978A (fr) * | 1971-11-29 | 1973-05-28 | Ciba Geigy | Preparation decolorante pour le procede photographique de decoloration a l'argent |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2100594A (en) * | 1932-05-05 | 1937-11-30 | Agfa Ansco Corp | Color photography |
US2564238A (en) * | 1946-12-14 | 1951-08-14 | Gen Aniline & Film Corp | Silver azo dye bleach-out process and bleaching baths for use therein |
US2936308A (en) * | 1955-06-02 | 1960-05-10 | John E Hodge | Novel reductones and methods of making them |
-
1968
- 1968-06-25 CH CH940468A patent/CH508899A/de not_active IP Right Cessation
-
1969
- 1969-05-13 SE SE06768/69A patent/SE359170B/xx unknown
- 1969-05-14 DE DE19691924723 patent/DE1924723A1/de active Pending
- 1969-06-18 US US834445A patent/US3620744A/en not_active Expired - Lifetime
- 1969-06-23 FR FR6921022A patent/FR2011649A1/fr not_active Withdrawn
- 1969-06-24 AT AT598569A patent/AT288160B/de not_active IP Right Cessation
- 1969-06-24 NL NL6909656A patent/NL6909656A/xx unknown
- 1969-06-24 BE BE735081D patent/BE735081A/xx unknown
- 1969-06-24 GB GB31834/69A patent/GB1255857A/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2100594A (en) * | 1932-05-05 | 1937-11-30 | Agfa Ansco Corp | Color photography |
US2564238A (en) * | 1946-12-14 | 1951-08-14 | Gen Aniline & Film Corp | Silver azo dye bleach-out process and bleaching baths for use therein |
US2936308A (en) * | 1955-06-02 | 1960-05-10 | John E Hodge | Novel reductones and methods of making them |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3961957A (en) * | 1973-05-18 | 1976-06-08 | Ciba-Geigy Ag | Dye bleach preparation for the photographic silver dye bleach process |
US3963492A (en) * | 1973-10-12 | 1976-06-15 | Ciba-Geigy Ag | Method for processing silver dye bleach materials |
US4014698A (en) * | 1974-07-10 | 1977-03-29 | Ciba-Geigy Ag | Method for processing silver dye bleach materials |
US5017226A (en) * | 1988-10-03 | 1991-05-21 | A. B. Dick Company | Ink and method for the development of concealed images |
US5084434A (en) * | 1988-10-03 | 1992-01-28 | A.B. Dick Company | Ink and method for the development of concealed iamges |
EP0568953A2 (de) * | 1992-05-04 | 1993-11-10 | Eastman Kodak Company | Verfahren und Zusammensetzungen zum Retuschieren von Filmbildern |
US5262285A (en) * | 1992-05-04 | 1993-11-16 | Eastman Kodak Company | Methods and compositions for retouching film images |
EP0568953A3 (de) * | 1992-05-04 | 1995-02-01 | Eastman Kodak Co | Verfahren und Zusammensetzungen zum Retuschieren von Filmbildern. |
US5895781A (en) * | 1997-12-22 | 1999-04-20 | S. C. Johnson & Son, Inc. | Cleaning compositions for ceramic and porcelain surfaces and related methods |
US5910475A (en) * | 1997-12-22 | 1999-06-08 | S. C. Johnson & Son, Inc. | Cleaning compositions for ceramic and porcelain surfaces and related methods |
US6417226B1 (en) * | 2000-12-12 | 2002-07-09 | Nicholas V. Perricone | Skin whiteners containing hydroxytetronic acid |
US20020141956A1 (en) * | 2000-12-12 | 2002-10-03 | Perricone Nicholas V. | Skin whiteners containing hydroxytetronic acid derivatives |
US7019029B2 (en) | 2000-12-12 | 2006-03-28 | Perricone Nicholas V | Skin whiteners containing hydroxytetronic acid derivatives |
Also Published As
Publication number | Publication date |
---|---|
SE359170B (de) | 1973-08-20 |
GB1255857A (en) | 1971-12-01 |
DE1924723A1 (de) | 1970-01-08 |
BE735081A (de) | 1969-12-24 |
AT288160B (de) | 1971-02-25 |
NL6909656A (de) | 1969-12-30 |
FR2011649A1 (de) | 1970-03-06 |
CH508899A (de) | 1971-06-15 |
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