US3623872A - Stabilisation of developed photographic images - Google Patents
Stabilisation of developed photographic images Download PDFInfo
- Publication number
- US3623872A US3623872A US33115A US3623872DA US3623872A US 3623872 A US3623872 A US 3623872A US 33115 A US33115 A US 33115A US 3623872D A US3623872D A US 3623872DA US 3623872 A US3623872 A US 3623872A
- Authority
- US
- United States
- Prior art keywords
- silver
- compounds
- development
- stabilisation
- developed photographic
- 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
- 230000006641 stabilisation Effects 0.000 title description 5
- 229910052709 silver Inorganic materials 0.000 abstract description 26
- 239000004332 silver Substances 0.000 abstract description 26
- -1 SILVER HALIDE Chemical class 0.000 abstract description 21
- 150000001875 compounds Chemical class 0.000 abstract description 18
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 14
- 238000005562 fading Methods 0.000 abstract description 5
- 239000000839 emulsion Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000003019 stabilising effect Effects 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 239000012190 activator Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 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 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 229910021607 Silver chloride Inorganic materials 0.000 description 3
- 229910021612 Silver iodide Inorganic materials 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 229940045105 silver iodide Drugs 0.000 description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 150000002391 heterocyclic compounds Chemical class 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 150000003378 silver Chemical class 0.000 description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 description 2
- CDAWCLOXVUBKRW-UHFFFAOYSA-N 2-aminophenol Chemical compound NC1=CC=CC=C1O CDAWCLOXVUBKRW-UHFFFAOYSA-N 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 239000001828 Gelatine Substances 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
- 239000004698 Polyethylene Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 229940101006 anhydrous sodium sulfite Drugs 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000006224 matting agent Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 150000004986 phenylenediamines Chemical class 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- RWPGFSMJFRPDDP-UHFFFAOYSA-L potassium metabisulfite Chemical compound [K+].[K+].[O-]S(=O)S([O-])(=O)=O RWPGFSMJFRPDDP-UHFFFAOYSA-L 0.000 description 1
- 229940043349 potassium metabisulfite Drugs 0.000 description 1
- 235000010263 potassium metabisulphite Nutrition 0.000 description 1
- ZNNZYHKDIALBAK-UHFFFAOYSA-M potassium thiocyanate Chemical compound [K+].[S-]C#N ZNNZYHKDIALBAK-UHFFFAOYSA-M 0.000 description 1
- 229940116357 potassium thiocyanate Drugs 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- NDGRWYRVNANFNB-UHFFFAOYSA-N pyrazolidin-3-one Chemical class O=C1CCNN1 NDGRWYRVNANFNB-UHFFFAOYSA-N 0.000 description 1
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 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
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 238000005406 washing Methods 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
- G03C5/29—Development processes or agents therefor
- G03C5/305—Additives other than developers
-
- 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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
- G03C1/43—Processing agents or their precursors, not covered by groups G03C1/07 - G03C1/42
-
- 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
- G03C5/38—Fixing; Developing-fixing; Hardening-fixing
- G03C5/39—Stabilising, i.e. fixing without washing out
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/164—Rapid access processing
Definitions
- Exposed and developed photographic silver images can be stabilised by treating the layer containing the exposed image with a compound which reacts with the silver halide in the unexposed and undeveloped areas of the layer to form a light-insensitive reaction product. Fading of the silver images thus produced is prevented by performing the development in the presence of heterocyclic carboxylalkyl mercapto compounds.
- the invention relates to a process for the production of photographic images by exposure, development and subsequent stabilisation, development being carried out in the presence of heterocyclic carboxyalkyl mercapto compounds which improve the stability of the silver image even after prolonged storage under extreme climatic conditions.
- Fading of the black image area can be prevented by adding to the stabilising bath heterocyclic mercapto compounds such as 1-phenyl-S-mercaptotetrazole.
- heterocyclic mercapto compounds such as 1-phenyl-S-mercaptotetrazole.
- the usual compounds of this type are only sparingly soluble in the acid stabiliser solutions so that it is difiicult to apply a sufiicient quantity of these compounds. They cannot be added in the required quantity to the emulsions because of their development inhibiting effect.
- Fading of the black image areas can also be prevented by adding to the emulsion compounds which only decompose in alkaline solution to yield a mercapto compound.
- Such compounds cannot be added to the emulsion in sufiicient quantities to improve satisfactorily the keeping quality of the stabilised image on prolonged storage under extreme climatic conditions.
- n 1 to 3.
- conventional light-sensitive photographic materials having at least one silver halide emulsion layer are suitable.
- the light-sensitive emulsions may contain any silver halides, such as silver chloride or silver bromide, if desired with a small proportion of silver iodide. Emulsions which have a high silver chloride content are preferred.
- the binders for the light-sensitive layers may be the usual water-permeable layer-forming substances, particularly proteins, preferably gelatine.
- the emulsions may contain alkylene oxide polymerisation products as chemical sensitizers. They may also contain the known stabilizers.
- the emulsions may contain developers or developer combinations of the type hydroquinone, pyrocatechol, aminophenol, compounds of the pyrazolidone series, phenylene diamine derivatives and the like, antioxidants for the developer, e.g. potassium metalbisulfite, aldehyde and ketone bisulfite, matting agents and brightening agents.
- developers or developer combinations of the type hydroquinone, pyrocatechol, aminophenol, compounds of the pyrazolidone series, phenylene diamine derivatives and the like antioxidants for the developer, e.g. potassium metalbisulfite, aldehyde and ketone bisulfite, matting agents and brightening agents.
- development is carried out in the usual manner, using known developers.
- the developer is added to the photographic material and development is initiated by treatment with an alkaline aqueous bath, hereinafter referred to as an activator bath.
- the concentration of the compounds for use according to the invention in the development bath may vary within wide limits. The concentration depends upon the photographic material used and the nature of the developer. The optimum concentrations for a particular reproduction process can be determined by a few simple laboratory tests. Amounts of 0.5 to 10 g. per liter of treatment bath, preferably 1 to 5 g. per liter, have generally been found to be sufficient.
- Suitable stabilising agents i.e. compounds which are capable of converting the silver halide remaining after development into a compound which is not sensitive to light, have been described e.g. in British Patents Nos. 631,184 or 959,807 and in U.S. Patent No. 2,525,532 or French Patent No. 1,237,454.
- Ammonium thiocyanate, and alkali metal thiocyanates, e.g. sodium or potassium thiocyanate, have been found to be particularly suitable.
- These stabilising baths may also contain the usual other additives such as alkali metal sulfites or metabisulfites or cycloalkanone bisulfites, acetic acid or its salts and organic compounds, particularly additional heterocyclic compounds which contain mercapto groups, such as l-phenyl- S-mercaptotetrazole, which form sparingly soluble silver salts.
- additives such as alkali metal sulfites or metabisulfites or cycloalkanone bisulfites, acetic acid or its salts and organic compounds, particularly additional heterocyclic compounds which contain mercapto groups, such as l-phenyl- S-mercaptotetrazole, which form sparingly soluble silver salts.
- a light-sensitive photographic material comprising a supported silver chloride gelatin emulsion layer which emulsion layer contains 0.2 mol of silver halide with a silver iodide content of less than 0.1 mol percent of silver iodide per kg. of emulsion (amount of silver in the form of silver halide 1.3 g./m. and hydroquinone (12 g. of hydroquinone per kg. of emulsion) is exposed to form an image and developed in the following activator solution:
- the samples are processed in a two-bath development apparatus customarily employed.
- the treatment time is about 1 t 5 seconds in the activator bath and about 2 to seconds in the stabilising bath.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
EXPOSED AND DEVELOPED PHOTOGRAPHIC SILVER IMAGES CAN BE STABILISED BY TREATING THE LAYER CONTAINING THE EXPOSED IMAGE WITH A COMPOUND WHICH REACTS WITHTHE SILVER HALIDE IN THE UNEXPOSED AND UNDEVELOPED AREAS OF THE LAYER TO FORM A LIGHT-INSENSITIVE REATION PRODUCT. FADING OF THE SILVER IMAGES THUS PRODUCED IS PREVENTED BY PERFORMING THE DEVELOPMENT IN THE PRESENCE OF HETEROCYCLIC CARBOXYLYALKYL MERCAPTO COMPOUNDS.
Description
United States Patent *Olfice 3,623,872 Patented Nov. 30, 1971 US. C]. 96-61 4 Claims ABSTRACT OF THE DISCLOSURE Exposed and developed photographic silver images can be stabilised by treating the layer containing the exposed image with a compound which reacts with the silver halide in the unexposed and undeveloped areas of the layer to form a light-insensitive reaction product. Fading of the silver images thus produced is prevented by performing the development in the presence of heterocyclic carboxylalkyl mercapto compounds.
Stabilisation of developed photographic images The invention relates to a process for the production of photographic images by exposure, development and subsequent stabilisation, development being carried out in the presence of heterocyclic carboxyalkyl mercapto compounds which improve the stability of the silver image even after prolonged storage under extreme climatic conditions.
It is known to stabilise developed photographic images with complex forming compounds in rapid photographic reproduction processes as a substitute for conventional fixing with sodium thiosulfate followed by washing. In contrast to the method of fixing with sodium thiosulfate, in these stabilizing processes the silver salts remain in the unexposed and undeveloped parts of the layer in the form of a light-insensitive reaction product of the stabilising compound with the original silver halides. Stabilization of developed photographic materials has, however, certain disadvantages. One disadvantage is that nearly all substances which form complexes with silver halides attack metallic silver and hence the photographic image, converting the silver into a complex compound or simple silver salt. This leads to fading of the silver image or to a change in the color of the image silver from black to a. brownish tone. This undesired elfect occurs particularly in a moist atmosphere.
Fading of the black image area can be prevented by adding to the stabilising bath heterocyclic mercapto compounds such as 1-phenyl-S-mercaptotetrazole. However, the usual compounds of this type are only sparingly soluble in the acid stabiliser solutions so that it is difiicult to apply a sufiicient quantity of these compounds. They cannot be added in the required quantity to the emulsions because of their development inhibiting effect.
Fading of the black image areas can also be prevented by adding to the emulsion compounds which only decompose in alkaline solution to yield a mercapto compound. Such compounds, however, cannot be added to the emulsion in sufiicient quantities to improve satisfactorily the keeping quality of the stabilised image on prolonged storage under extreme climatic conditions.
It is among the objects of the present invention to provide compounds which do not show the disadvantages referred to above, and which are stabilising black silver images particularly upon prolonged storage under extreme climatic conditions.
We now have found a process for the production of photographic images including the steps of exposing a supported silver halide emulsion layer, developing and stabilising the exposed and developed layer wherein development is carried out with a bath which contains at least one heterocyclic compound of the following formulae:
wherein n is 1 to 3.
Suitable compounds are summarized in the following table:
The preparation of these compounds is described in US. Patent No. 3,330,663.
For operating the process according to the invention, conventional light-sensitive photographic materials having at least one silver halide emulsion layer are suitable. The light-sensitive emulsions may contain any silver halides, such as silver chloride or silver bromide, if desired with a small proportion of silver iodide. Emulsions which have a high silver chloride content are preferred.
The binders for the light-sensitive layers may be the usual water-permeable layer-forming substances, particularly proteins, preferably gelatine.
Furthermore, the emulsions may contain alkylene oxide polymerisation products as chemical sensitizers. They may also contain the known stabilizers.
In addition, the emulsions may contain developers or developer combinations of the type hydroquinone, pyrocatechol, aminophenol, compounds of the pyrazolidone series, phenylene diamine derivatives and the like, antioxidants for the developer, e.g. potassium metalbisulfite, aldehyde and ketone bisulfite, matting agents and brightening agents.
Development is carried out in the usual manner, using known developers. According to a preferred method of carrying out the invention, the developer is added to the photographic material and development is initiated by treatment with an alkaline aqueous bath, hereinafter referred to as an activator bath.
The concentration of the compounds for use according to the invention in the development bath may vary within wide limits. The concentration depends upon the photographic material used and the nature of the developer. The optimum concentrations for a particular reproduction process can be determined by a few simple laboratory tests. Amounts of 0.5 to 10 g. per liter of treatment bath, preferably 1 to 5 g. per liter, have generally been found to be sufficient.
Suitable stabilising agents, i.e. compounds which are capable of converting the silver halide remaining after development into a compound which is not sensitive to light, have been described e.g. in British Patents Nos. 631,184 or 959,807 and in U.S. Patent No. 2,525,532 or French Patent No. 1,237,454. Ammonium thiocyanate, and alkali metal thiocyanates, e.g. sodium or potassium thiocyanate, have been found to be particularly suitable.
These stabilising baths may also contain the usual other additives such as alkali metal sulfites or metabisulfites or cycloalkanone bisulfites, acetic acid or its salts and organic compounds, particularly additional heterocyclic compounds which contain mercapto groups, such as l-phenyl- S-mercaptotetrazole, which form sparingly soluble silver salts.
3 EXAMPLE 1 A light-sensitive photographic material comprising a supported silver chloride gelatin emulsion layer which emulsion layer contains 0.2 mol of silver halide with a silver iodide content of less than 0.1 mol percent of silver iodide per kg. of emulsion (amount of silver in the form of silver halide 1.3 g./m. and hydroquinone (12 g. of hydroquinone per kg. of emulsion) is exposed to form an image and developed in the following activator solution:
50 g. of sodium hydroxide 40 g. of anhydrous sodium sulfite 2 g. of potassium bromide 1 g. of 1-phenylpyrazolidone-(3) made up to 1 liter with water.
The compounds shown in the following table are added to the above activator solution. The quantities added are shown in the table.
The developed material is then treated with the following stabilising solution:
250 g. of ammonium thiocyanate 145 g. of potassium metabisulfite 100 ml. of a 3% aqueous solution of formaldehyde 25 ml. of 60% acetic acid,
made up to 1 liter with water.
The samples are processed in a two-bath development apparatus customarily employed. The treatment time is about 1 t 5 seconds in the activator bath and about 2 to seconds in the stabilising bath.
To test the stability in storage of the silver image, a portion of the copy is kept over water in a vessel for 24 hours.
Several of these uniformly moist portions of the copy are inserted into a polyethylene container and this container is placed in a bag containing 30 ml. of water and sealed. The sealed containers are stored in a heating cupboard at 60 C. for 5, 24 and 48 hours, respectively, and the change of the silver image which has taken place after this time is examined.
Whereas the silver image of the copies produced according to the invention remains black or dark brown to black depending on the time of storage, under the above condition the comparison sample shows discoloration varying from brown to pale brown. The maximum density of .4 the various fresh, air-dried materials and those which have been stored in moist heat is measured in a densitometer. The following results are obtained:
TABLE Maximum density after storage Concenin moist heat for- Compound added tration, Air N o. g./l. dried 5 hours 24 hours 48 hours We claim:
1. A process for the production of photographic images by exposure of a photographic material which has at least one silver halide emulsion layer, development and stabilisation of the unexposed and undeveloped silver halide, wherein development is performed with a bath containing at least one compound of the following formula or salts thereof:
References Cited UNITED STATES PATENTS 3,330,663 7/1967 Weyde 96-114.3
NORMAN G. TORCHIN, Primary Examiner M. F. KELLEY, Assistant Examiner US. Cl. X.R. 96-66, 95
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691921740 DE1921740A1 (en) | 1969-04-29 | 1969-04-29 | Stabilization of developed photographic images |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3623872A true US3623872A (en) | 1971-11-30 |
Family
ID=5732710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US33115A Expired - Lifetime US3623872A (en) | 1969-04-29 | 1970-04-16 | Stabilisation of developed photographic images |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3623872A (en) |
| BE (1) | BE748628A (en) |
| DE (1) | DE1921740A1 (en) |
| FR (1) | FR2040413A1 (en) |
| GB (1) | GB1249277A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3981731A (en) * | 1974-11-09 | 1976-09-21 | Agfa-Gevaert, A.G. | Stabilization of developed photographic images |
| US4371610A (en) * | 1980-07-24 | 1983-02-01 | Fuji Photo Film Co., Ltd. | Process for development-processing silver halide light-sensitive material |
| DE3525900A1 (en) * | 1984-07-19 | 1986-01-23 | Fuji Photo Film Co., Ltd., Minami-Ashigara, Kanagawa | METHOD FOR DEVELOPING PHOTOGRAPHIC COLOR REVERSING MATERIALS |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4093462A (en) * | 1976-11-11 | 1978-06-06 | Eastman Kodak Company | 2,5-Bis(secondary amino) oxa- and thiadiazole photographic developing agents |
| US5004669A (en) * | 1988-10-31 | 1991-04-02 | Konica Corporation | Light-sensitive silver halide photographic material |
-
1969
- 1969-04-29 DE DE19691921740 patent/DE1921740A1/en active Pending
-
1970
- 1970-04-08 BE BE748628D patent/BE748628A/en unknown
- 1970-04-16 US US33115A patent/US3623872A/en not_active Expired - Lifetime
- 1970-04-29 GB GB20532/70A patent/GB1249277A/en not_active Expired
- 1970-04-29 FR FR7015770A patent/FR2040413A1/fr not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3981731A (en) * | 1974-11-09 | 1976-09-21 | Agfa-Gevaert, A.G. | Stabilization of developed photographic images |
| US4371610A (en) * | 1980-07-24 | 1983-02-01 | Fuji Photo Film Co., Ltd. | Process for development-processing silver halide light-sensitive material |
| DE3525900A1 (en) * | 1984-07-19 | 1986-01-23 | Fuji Photo Film Co., Ltd., Minami-Ashigara, Kanagawa | METHOD FOR DEVELOPING PHOTOGRAPHIC COLOR REVERSING MATERIALS |
| US4675274A (en) * | 1984-07-19 | 1987-06-23 | Fuji Photo Film Co., Ltd. | Method for developing color reversal photographic materials |
| DE3525900B4 (en) * | 1984-07-19 | 2005-12-29 | Fuji Photo Film Co., Ltd., Minami-Ashigara | A method of processing an imagewise exposed color reversal silver halide photographic material |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1921740A1 (en) | 1970-11-12 |
| BE748628A (en) | 1970-10-08 |
| FR2040413A1 (en) | 1971-01-22 |
| GB1249277A (en) | 1971-10-13 |
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