GB926646A - Improvements in photographic half-tone reproduction - Google Patents
Improvements in photographic half-tone reproductionInfo
- Publication number
- GB926646A GB926646A GB22690/59A GB2269059A GB926646A GB 926646 A GB926646 A GB 926646A GB 22690/59 A GB22690/59 A GB 22690/59A GB 2269059 A GB2269059 A GB 2269059A GB 926646 A GB926646 A GB 926646A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- mole per
- mole
- sulphite
- restrainer
- 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
- 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
Abstract
926,646. Photographic half-tone copying. KODAK Ltd. July 2, 1959 [July 2, 1958], No. 22690/59. Class 98 (2). For high or extreme contrast reproduction a half-tone or line image is exposed to a silverhalide emulsion layer having at least 85 mole per cent silver chloride and this is developed in a solution containing a hydroquinone developing agent, 0.01 to 0.05 molar of sulphite ion, a restrainer and sufficient alkali to give a pH of at least 9.0. The emulsions may be of 85 to 100 mole per cent chloride: those containing 5 to 15 mole. per cent bromide are especially useful, 1 to 2 mole per cent iodide also may be present. The developing agent may be hydroquinone itself, the sulphite ion may be formed from sodium sulphite or sodium formaldehyde bisulphite, a bromide is used as restrainer and carbonate as alkali. Other addenda may be present in the emulsions and developer as well. Four examples quote emulsion and developer mixings and specify contrast gradient and dot quality data, including comparisons over a range of materials within and not within the terms of the invention, after fixing in hypo. Specifications 235,211, 606,141, 654,690, 680,593, 682,355, 777,181 and 841,136 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US746078A US3030209A (en) | 1958-07-02 | 1958-07-02 | High-contrast photographic silver chloride emulsions and method of processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB926646A true GB926646A (en) | 1963-05-22 |
Family
ID=24999392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22690/59A Expired GB926646A (en) | 1958-07-02 | 1959-07-02 | Improvements in photographic half-tone reproduction |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3030209A (en) |
| GB (1) | GB926646A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1209925A (en) * | 1957-03-08 | 1960-03-04 | Kodak Pathe | New treatment process for color photography and revealing for its implementation |
| US3128180A (en) * | 1958-07-02 | 1964-04-07 | Eastman Kodak Co | Hardened high-contrast photographic silver chloride emulsions and method of processing |
| US3212895A (en) * | 1960-12-20 | 1965-10-19 | Eastman Kodak Co | Stability of rapid-processed photographic materials |
| US3325286A (en) * | 1961-08-28 | 1967-06-13 | Du Pont | Photographic emulsions and elements |
| BE631556A (en) * | 1962-04-26 | |||
| BE631419A (en) * | 1962-05-14 | |||
| US3294540A (en) * | 1963-12-17 | 1966-12-27 | Eastman Kodak Co | Lith-type emulsions with block co-polymers |
| US3655381A (en) * | 1969-04-24 | 1972-04-11 | Eastman Kodak Co | Process for the production of integrally formed, random dot photographic images |
| US3960567A (en) * | 1971-08-21 | 1976-06-01 | Fuji Photo Film Co., Ltd. | Process and composition for producing photolithographic plate for the graphic arts |
| GB1550356A (en) * | 1975-05-01 | 1979-08-15 | Agfa Gevaert | Hardening developers for silver halide photography |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE539322A (en) * | 1954-06-29 | |||
| US2845349A (en) * | 1955-09-07 | 1958-07-29 | Powers Chemco Inc | Photographic developers |
| BE572846A (en) * | 1957-12-26 |
-
1958
- 1958-07-02 US US746078A patent/US3030209A/en not_active Expired - Lifetime
-
1959
- 1959-07-02 GB GB22690/59A patent/GB926646A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3030209A (en) | 1962-04-17 |
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