GB701051A - Process for the direct production of positive photographic images - Google Patents
Process for the direct production of positive photographic imagesInfo
- Publication number
- GB701051A GB701051A GB7356/51A GB735651A GB701051A GB 701051 A GB701051 A GB 701051A GB 7356/51 A GB7356/51 A GB 7356/51A GB 735651 A GB735651 A GB 735651A GB 701051 A GB701051 A GB 701051A
- Authority
- GB
- United Kingdom
- Prior art keywords
- emulsion
- silver
- layer
- paper
- thin
- 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
- G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
- G03C8/02—Photosensitive materials characterised by the image-forming section
- G03C8/04—Photosensitive materials characterised by the image-forming section the substances transferred by diffusion consisting of inorganic or organo-metallic compounds derived from photosensitive noble metals
- G03C8/06—Silver salt diffusion transfer
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
701,051. Photographic process. FARBENFABRIKEN BAYER. March 29, 1951 [March 29, 1950], No. 7356/51. Class 98(2) Photographic positive silver images are produced by developing with an alkaline solution in the presence of a developing agent an exposed silver halide emulsion layer in close contact with one side of a thin water-permeable sheet of which the other side is in close contact with a non-lightsensitive water-permeable colloid layer containing a silver halide solvent, part of the unexposed silver halide being dissolved by the silver halide solvent which has diffused through the thin waterpermeable sheet to the emulsion layer and being developed in the water-permeable sheet to provide a positive silver image therein, The thin sheet, which may be of regenerated cellulose or paper, may contain development nuclei, e.g: colloidal silver or gold colloidal silver sulphide, selenide, or telluride, or substances forming development nuclei during development, e.g. sodium sulphide. Substances suitable as development nuclei may have been produced in the paper during sizing. Development nuclei may also be incorporated in the colloid layer. The developing agent may be incorporated, wholly or in part, in the emulsion, and development effected in an alkaline solution. At least part of the silver halide solvent may be added to the developer, and tone-modifying substances, e.g. mercapto compounds, may be added to the emulsion or the thin water-permeable sheet. In an example, a paper support 1 is coated with a silver chlorobromide emulsion 2 containing hydroquinone, potassium metabisulphite, and 1-phenyl-5-mercaptotetrazole A paper support 5 is coated with a gelatin layer.4 containing hypo. A thin weakly sized typewriting paper 3 is immersed in a weak colloidal silver solution and dried. After exposure of the emulsion 2, the materials are drawn through an aqueous solution of sodium sulphite and sodium hydroxide, the emulsion 2 is contacted with one side of the paper 3, and the layer 4 is contacted with the other side, either in the solution or immediately after leaving it and after about a minute the layers are separated, a positive image having been formed on the layer 3. Only one or two of the three constituent materials need be immersed in the developer. Specifications 305,143, [Class 98(2)], 561,875, and 614,155 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF1158A DE825349C (en) | 1950-03-29 | 1950-03-29 | Process for the direct production of positives |
Publications (1)
Publication Number | Publication Date |
---|---|
GB701051A true GB701051A (en) | 1953-12-16 |
Family
ID=7082742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7356/51A Expired GB701051A (en) | 1950-03-29 | 1951-03-29 | Process for the direct production of positive photographic images |
Country Status (6)
Country | Link |
---|---|
US (1) | US2709135A (en) |
BE (1) | BE502129A (en) |
CH (1) | CH291535A (en) |
DE (1) | DE825349C (en) |
FR (1) | FR1080425A (en) |
GB (1) | GB701051A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3250619A (en) * | 1962-06-25 | 1966-05-10 | Eastman Kodak Co | Stain-free paper |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2500421A (en) * | 1944-11-03 | 1950-03-14 | Polaroid Corp | Photographic silver halide transfer process |
US2543181A (en) * | 1947-01-15 | 1951-02-27 | Polaroid Corp | Photographic product comprising a rupturable container carrying a photographic processing liquid |
US2584030A (en) * | 1947-02-07 | 1952-01-29 | Polaroid Corp | Light sensitive silver halide photographic product for image transfer and process utilizing the same |
US2647056A (en) * | 1948-02-12 | 1953-07-28 | Polaroid Corp | One step photographic transfer process |
US2635048A (en) * | 1948-07-06 | 1953-04-14 | Polaroid Corp | Photographic transfer product and process |
-
0
- BE BE502129D patent/BE502129A/xx unknown
-
1950
- 1950-03-29 DE DEF1158A patent/DE825349C/en not_active Expired
-
1951
- 1951-01-25 CH CH291535D patent/CH291535A/en unknown
- 1951-03-28 US US217910A patent/US2709135A/en not_active Expired - Lifetime
- 1951-03-28 FR FR1080425D patent/FR1080425A/en not_active Expired
- 1951-03-29 GB GB7356/51A patent/GB701051A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3250619A (en) * | 1962-06-25 | 1966-05-10 | Eastman Kodak Co | Stain-free paper |
Also Published As
Publication number | Publication date |
---|---|
US2709135A (en) | 1955-05-24 |
DE825349C (en) | 1951-12-17 |
FR1080425A (en) | 1954-12-09 |
BE502129A (en) | |
CH291535A (en) | 1953-06-30 |
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