GB1306801A - Production of photographic silver images - Google Patents
Production of photographic silver imagesInfo
- Publication number
- GB1306801A GB1306801A GB1716169A GB1306801DA GB1306801A GB 1306801 A GB1306801 A GB 1306801A GB 1716169 A GB1716169 A GB 1716169A GB 1306801D A GB1306801D A GB 1306801DA GB 1306801 A GB1306801 A GB 1306801A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shells
- cores
- silver halide
- exposure
- developer
- 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
Links
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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/485—Direct positive emulsions
- G03C1/48515—Direct positive emulsions prefogged
-
- 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
- G03C1/015—Apparatus or processes for the preparation of emulsions
-
- 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
- G03C1/04—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with macromolecular additives; with layer-forming substances
-
- 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
- G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
- G03C2001/03511—Bromide content
-
- 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
- G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
- G03C2001/03535—Core-shell grains
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
1306801 Photographic silver halide material AGFA-GEVAERT AG 10 March 1970 [2 April 1969] 17161/69 Heading G2C A photographic material containing a silver halide emulsion layer comprises composite silver halide grains which contain internal sensitivity specks which have been produced by chemically ripening the core grains, and precipitating on the cores a shell of unripened silver halide, and in which the shells have been chemically fogged, the degree of chemical fogging of the shells being such that if the material were imagewise exposed and developed using an exposure E n , which is less than a certain exposure E max , which is the exposure necessary to give a maximum density then a negative image would be obtained, whereas if the exposure E p which is used were greater than E max a direct-positive image would be obtained, the development being carried out under the same conditions. The developer may be a lith-developer i.e. one which contains an addition compound of an aliphatic aldehyde or ketone with a bisulphite and hydroquinone as the sole developing agent. The cores and shells of the grains may comprise silver bromide. Chemical ripening of the cores may be effected with a compound of a noble metal (i.e. Au, Os, Ir, Pt, Ru, Rh or Pd) e.g. gold (III) chloride, a sulphur compound e.g. ammonium thiocyanate, a reducing agent or mixtures thereof. The pAg may be kept constant during the precipitation of the silver bromide cores. Chemical fogging of the shells may be effected with a reducing agent e.g. formamidine sulphinic acid. The degree of chemical fogging of the shells and the particular developer used determine whether or not negative and direct-positive images can be obtained from a particular material.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1716169 | 1969-04-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1306801A true GB1306801A (en) | 1973-02-14 |
Family
ID=10090364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1716169A Expired GB1306801A (en) | 1969-04-02 | 1969-04-02 | Production of photographic silver images |
Country Status (5)
Country | Link |
---|---|
US (1) | US3709689A (en) |
JP (1) | JPS5036569B1 (en) |
BE (1) | BE748059A (en) |
DE (1) | DE2015070A1 (en) |
GB (1) | GB1306801A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4828962A (en) * | 1986-10-15 | 1989-05-09 | Minnesota Mining And Manufacturing Company | High contrast scanner photographic elements employing ruthenium and iridium dopants |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5551780U (en) * | 1978-10-02 | 1980-04-05 | ||
JPS57120242U (en) * | 1981-01-20 | 1982-07-26 | ||
JPS57166169U (en) * | 1981-04-14 | 1982-10-20 | ||
DE3229999A1 (en) * | 1982-08-12 | 1984-02-16 | Agfa-Gevaert Ag, 5090 Leverkusen | PHOTOGRAPHIC SILVER HALOGEN EMULSION |
JPS59135459A (en) * | 1983-01-24 | 1984-08-03 | Fuji Photo Film Co Ltd | Image forming method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3294540A (en) * | 1963-12-17 | 1966-12-27 | Eastman Kodak Co | Lith-type emulsions with block co-polymers |
US3367778A (en) * | 1965-04-15 | 1968-02-06 | Eastman Kodak Co | Silver salt direct positive emulsion |
US3501307A (en) * | 1966-03-11 | 1970-03-17 | Eastman Kodak Co | Photographic reversal materials containing organic desensitizing compounds |
-
1969
- 1969-04-02 GB GB1716169A patent/GB1306801A/en not_active Expired
-
1970
- 1970-03-27 BE BE748059D patent/BE748059A/en unknown
- 1970-03-28 DE DE19702015070 patent/DE2015070A1/en active Pending
- 1970-04-01 JP JP45028232A patent/JPS5036569B1/ja active Pending
- 1970-04-02 US US00025091A patent/US3709689A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4828962A (en) * | 1986-10-15 | 1989-05-09 | Minnesota Mining And Manufacturing Company | High contrast scanner photographic elements employing ruthenium and iridium dopants |
Also Published As
Publication number | Publication date |
---|---|
US3709689A (en) | 1973-01-09 |
DE2015070A1 (en) | 1970-10-15 |
JPS5036569B1 (en) | 1975-11-26 |
BE748059A (en) | 1970-09-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee |