GB365661A - Improved process for the manufacture and production of coloured photographic pictures - Google Patents
Improved process for the manufacture and production of coloured photographic picturesInfo
- Publication number
- GB365661A GB365661A GB3233930A GB3233930A GB365661A GB 365661 A GB365661 A GB 365661A GB 3233930 A GB3233930 A GB 3233930A GB 3233930 A GB3233930 A GB 3233930A GB 365661 A GB365661 A GB 365661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bath
- silver
- leuco compound
- treated
- colour
- 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
365,661. Colour photographs. JOHNSON, J. Y., 47, Lincoln's Inn Fields, London. -(I. G. Farbenindustrie Akt.-Ges. ; Frankfort-on-Main, Germany.) Oct. 28, 1930, No. 32339. [Class 98 (ii).] A silver print is transformed into a colour image by treatment with a bleaching bath containing a water soluble leuco compound of a vat dyestuff which is insoluble and fast to light, a per-compound and a water soluble halide, whereby the leuco compound is oxidized simultaneously with and in the presence of the silver of the image but not generally. Bleaching baths containing chromates and/or thiocyanates cannot be used. A bath exemplified contains ammonium persulphate, sulphuric acid, copper sulphate, potassium bromide and Indigosol pink (S.R. Extra). The colour print formed may be treated in a fixing bath to eliminate the silver halide. Alternatively the leuco compound may be incorporated in the silver emulsion, and after development treated in an oxidizing and bleaching bath. For example the emulsion may contain the sodium salt of the sulphuric ester from penta-bromindigo, and after ordinary developing be treated in a bath as specified above but without the leuco compound.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE546470T | 1930-04-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB365661A true GB365661A (en) | 1932-01-28 |
Family
ID=34427985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3233930A Expired GB365661A (en) | 1930-04-20 | 1930-10-28 | Improved process for the manufacture and production of coloured photographic pictures |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE546470C (en) |
| FR (1) | FR715203A (en) |
| GB (1) | GB365661A (en) |
-
1930
- 1930-04-20 DE DE1930546470D patent/DE546470C/en not_active Expired
- 1930-10-28 GB GB3233930A patent/GB365661A/en not_active Expired
-
1931
- 1931-04-14 FR FR715203D patent/FR715203A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR715203A (en) | 1931-11-27 |
| DE546470C (en) | 1932-03-18 |
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