GB539391A - Methods of colour photography and materials therefor - Google Patents
Methods of colour photography and materials thereforInfo
- Publication number
- GB539391A GB539391A GB220140A GB220140A GB539391A GB 539391 A GB539391 A GB 539391A GB 220140 A GB220140 A GB 220140A GB 220140 A GB220140 A GB 220140A GB 539391 A GB539391 A GB 539391A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dye
- auxiliary
- layer
- image
- green
- 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
- G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Materials For Photolithography (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
Abstract
539,391. Colour photography. KODAK, Ltd. (Eastman Kodak Co.). Feb. 5, 1940, No. 2201. [Class 98 (ii)] In the production of colour photographs from multilayer material by the dye-destruction process, balance as regards contrast is obtained by the incorporation in one or more lightsensitive layers, which contain an imageforming dye or dye-forming substance, of an auxiliary dye absorbing light by which the layer containing it is intended to be exposed, and removing the auxiliary dye after exposure. The auxiliary dye is preferably soluble in water or sodium carbonate solution, and may have a tendency to diffuse and should not be bleached image-wise. In three-layer material in which at least two emulsion layers contain imageforming dyes, auxiliary dyes are preferably, but not necessarily, employed in each imagedye-containing layer. The auxiliary dye is preferably of a colour complementary to the layer-sensitivity. The material may be a threelayer or a two-layer mixed grain material. The image-forming dye may be added as such or in its leuco form, the dye being then produced before or after exposure. The dye-destruction bath may comprise thiourea, sulphuric acid, and potassium bromide or may be alkaline stannous chloride. In an example, the material comprises a support carrying in superposition an infra-red sensitized emulsion containing a magenta image dye and a blue-green auxiliary dye, a green-sensitized emulsion containing a yellow image dye and a magenta auxiliary dye, and a blue-sensitive emulsion containing a blue-green image dye and a yellow auxiliary dye. The infra-red sensitizer may be kryptocyanine and the green-sensitizer pinaflavol. The material is exposed through the bluesensitive layer. Auxiliary dyes referred to are Tartrazine, Chromotrop BB, Alizarin Celestol, and Brilliant Paper Yellow. Specifications 133,034, [Class 98 (ii)], 468,560, 477,524, 503,752, 521,746, 521,833, 521,834, 521,835, 521,836, 521,837 and 521,888 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB220140A GB539391A (en) | 1940-02-05 | 1940-02-05 | Methods of colour photography and materials therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB220140A GB539391A (en) | 1940-02-05 | 1940-02-05 | Methods of colour photography and materials therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB539391A true GB539391A (en) | 1941-09-09 |
Family
ID=9735360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB220140A Expired GB539391A (en) | 1940-02-05 | 1940-02-05 | Methods of colour photography and materials therefor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB539391A (en) |
-
1940
- 1940-02-05 GB GB220140A patent/GB539391A/en not_active Expired
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