GB1242739A - Improvements in silver halide direct-positive emulsions - Google Patents
Improvements in silver halide direct-positive emulsionsInfo
- Publication number
- GB1242739A GB1242739A GB61192/68A GB6119268A GB1242739A GB 1242739 A GB1242739 A GB 1242739A GB 61192/68 A GB61192/68 A GB 61192/68A GB 6119268 A GB6119268 A GB 6119268A GB 1242739 A GB1242739 A GB 1242739A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silver halide
- emulsion
- emulsions
- direct
- rhodium
- 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
- G03C1/48523—Direct positive emulsions prefogged characterised by the desensitiser
- G03C1/4853—Direct positive emulsions prefogged characterised by the desensitiser polymethine dyes
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
1,242,739. Silver halide direct-positive emulsions. KONISHIROKU PHOTO INDUSTRY CO. Ltd. Dec.23, 1968 [Dec. 23, 1967], No. 61192/68. Heading G2C. A light-sensitive silver halide direct-positive photographic emulsion contains a water-soluble salt or complex salt of rhodium, at least one merocyanine or trimethine cyanine sensitizing dye and at least one magenta, yellow or cyan colour coupler. The compounds are called colour couplers in order to make their chemical structure clear and are not used to form coloured images in this case. Many colour couplers are listed in the Specification. The colour coupler is preferably present in an amount of from 7À5-150g per mole of silver halide. The emulsion preferably contains 10-800 mg of a sensitizing dye for light of long wavelength per mole of silver halide. The rhodium compound is preferably a rhodium halide or a hexahalorhodate. An organic desensitizer may be used in conjunction with the coupler. The organic desensitizer may be pinakryptol yellow, pinakryptol green or phenosofranine. The emulsion is preferably a silver chlorobromoiodide emulsion. The emulsion may also contain stabilizers, hardening agents or matting agents. These emulsions are resistant to fogging and sensitized only in the appropriate wavelength regions. The amount of sensitizing dye, required to attain the same sensitivity as that of conventional light-sensitive silver halide direct-positive photographic emulsions, can be reduced and dye-staining on the white background of the material after development can be prevented.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8231067 | 1967-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1242739A true GB1242739A (en) | 1971-08-11 |
Family
ID=13770970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB61192/68A Expired GB1242739A (en) | 1967-12-23 | 1968-12-23 | Improvements in silver halide direct-positive emulsions |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3576636A (en) |
| DE (1) | DE1815967A1 (en) |
| GB (1) | GB1242739A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3740568A (en) * | 1970-10-29 | 1973-06-19 | Niles Parts Co Ltd | Pushbutton lock |
| JPS495616A (en) * | 1972-05-04 | 1974-01-18 | ||
| GB1427525A (en) * | 1972-07-13 | 1976-03-10 | Agfa Gevaert | Directpositive silver halide emulsions |
| JPS5110935A (en) * | 1974-07-18 | 1976-01-28 | Fuji Photo Film Co Ltd | |
| JPS5116924A (en) * | 1974-08-01 | 1976-02-10 | Fuji Photo Film Co Ltd | Shashinyomazentakapuraa |
| JPS5117437A (en) * | 1974-08-02 | 1976-02-12 | Fuji Photo Film Co Ltd | Shashinyokaraakaburaa |
| DE2708466A1 (en) * | 1977-02-26 | 1978-08-31 | Agfa Gevaert Ag | EMULSION MIXTURES FOR COLOR REVERSE (SUPERVISORY) MATERIAL |
| US4273862A (en) * | 1977-06-11 | 1981-06-16 | Mitsubishi Paper Mills, Ltd. | Direct-positive silver halide photographic sensitive materials |
| JPS5946384B2 (en) * | 1978-09-13 | 1984-11-12 | 富士写真フイルム株式会社 | yellow coupler |
| JPS5916261B2 (en) * | 1978-12-20 | 1984-04-14 | 富士写真フイルム株式会社 | Color image forming method |
-
1968
- 1968-12-16 US US784103A patent/US3576636A/en not_active Expired - Lifetime
- 1968-12-20 DE DE19681815967 patent/DE1815967A1/en not_active Withdrawn
- 1968-12-23 GB GB61192/68A patent/GB1242739A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3576636A (en) | 1971-04-27 |
| DE1815967A1 (en) | 1969-11-06 |
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