GB404856A - Improvements in the photographic production of multi-colour pictures - Google Patents
Improvements in the photographic production of multi-colour picturesInfo
- Publication number
- GB404856A GB404856A GB14322/33A GB1432233A GB404856A GB 404856 A GB404856 A GB 404856A GB 14322/33 A GB14322/33 A GB 14322/33A GB 1432233 A GB1432233 A GB 1432233A GB 404856 A GB404856 A GB 404856A
- Authority
- GB
- United Kingdom
- Prior art keywords
- record
- green
- red
- blue
- dyed
- 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
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/26—Silver halide emulsions for subtractive colour processes
Abstract
404,856. Colour photography. I. G. FARBENINDUSTRIE AKT.-GES., Frankforton-Main, Germany. May 17, 1933, No. 14322. Convention date, Feb. 3. [Class 98 (ii).] In the production of multicolour photographs or kinematograph films in which colour-record components are produced in super imposition in the same silver halide emulsion layer, an unfixed, chemically-toned print is first made from one component negative, and before printing the remaining component negatives the sensitivity of the unchanged silver halide is restored by means of a reducing agent, such as a sulphite, which does not reduce silver bromide, sodium sulphite or bisulphite, potassium metabisulphite, hydrazine sulphate and hydroxylamine being mentioned. Sensitive material may be used provided with an emulsion sensitized for one spectral region and dyed with a filter dye which is removable or decolourisable in the subsequent treatment (e.g. development), and is of a colour complementary to that of said region ; and the material may have such a dyed emulsion on each side, the two emulsions being sensitized for different colours. In examples (1) a film for two-colour work, bearing an ordinary emulsion layer dyed yellow, is exposed from the layer side behind a red-record negative and developed but not fixed, and the image is toned blue with a bath prepared from potassium ferricyanide, sodium bichromate, iron ammonium alum and oxalic acid ; the sensitivity of the unchanged silver halide is restored with sodium sulphite, and the layer is exposed from either side behind the blue-record negative, developed with an acid developer such as amidol, and fixed, and the silver image is first bleached with a bath containing potassium iodide, iodine and acetic acid, and then dyed orange with a mixture of auramine and fuchsine ; (2) a film for threecolour work bearing on one side an emulsion as in (1), and on the other side a green-sensitive emulsion dyed red, is exposed simultaneously to the green-record and red-record negatives, developed but not fixed, and the print on the ordinary emulsion from the red record is toned blue as in (1) as by flotation ; after reviving the layer with potassium metabisulphite, the unchanged silver halide is exposed behind the blue-record negative, and through the bluetoned image, preferably to green-blue light, developed with an acid developer and fixed, and the silver images are first bleached with a bath prepared from copper sulphate, acetic acid, potassium sulphocyanide and saltpetre, and are then dyed as by flotation or coating, that from the blue record with auramine and that from the green record with fuchsine: (3) a film as in (2) is exposed to green light, under the redrecord negative, from the side bearing the ordinary emulsion, in order to produce a print in the support-side of the green-sensitive layer, and then to blue light under the green-record negative to produce a print directly on the ordinary emulsion layer; after developing, without fixing, the print from the red record is toned blue as in (2), and the film is revived with a bath of hydrazine sulphate and citric acid ; the blue-record negative is printed by green light directly on the green-sensitive layer, and the image is developed in an acid developer and fixed, the two silver images being then bleached and coloured as in (2) : (4) a film bearing on one side a red-sensitive emulsion dyed green, and on the other side a greensensitive emulsion dyed red, is exposed to green light, under the green-record negative, from the red-sensitive side, and, simultaneously or not, to red light, under the red-record negative, from the green-sensitive side, and is developed without fixing ; the print from the red record is toned iron blue, and the other print is copper bleached as in (2), treatment in each case being confined to one side ; after reviving the layers with potassium metabisulphite, the blue-record negative is printed directly on the layer containing the blue-toned image, and a grey key image is printed directly on the other layer, the film is developed with an acid developer and fixed, the print from the blue-record negative is copper-bleached as in (2) and dyed yellow with auramine, and the previously-bleached print from the green-record negative is dyed red with fuchsine, the grey-key image in the same layer remaining unaffected. Tartrazine, Rapid Filter Red, Rose Bengal and Filter Green are mentioned as filter dyestuffs, and formulae are given for the developing, reviving, bleaching, and toning baths.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE404856X | 1933-02-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB404856A true GB404856A (en) | 1934-01-25 |
Family
ID=6421850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB14322/33A Expired GB404856A (en) | 1933-02-03 | 1933-05-17 | Improvements in the photographic production of multi-colour pictures |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB404856A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE743535C (en) * | 1939-08-26 | 1943-12-29 | Ig Farbenindustrie Ag | Process for producing colored images with a superimposed correction image in a multilayer photographic material with dye formers |
US2439901A (en) * | 1941-12-27 | 1948-04-20 | Henry T Neumann | Method for producing colored photographs |
CN108279549A (en) * | 2017-12-04 | 2018-07-13 | 上海大学 | The method for carrying out nano silver dielectric material imaging using sensitive film |
-
1933
- 1933-05-17 GB GB14322/33A patent/GB404856A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE743535C (en) * | 1939-08-26 | 1943-12-29 | Ig Farbenindustrie Ag | Process for producing colored images with a superimposed correction image in a multilayer photographic material with dye formers |
US2439901A (en) * | 1941-12-27 | 1948-04-20 | Henry T Neumann | Method for producing colored photographs |
CN108279549A (en) * | 2017-12-04 | 2018-07-13 | 上海大学 | The method for carrying out nano silver dielectric material imaging using sensitive film |
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