US2291834A - Color photographic reversal process - Google Patents
Color photographic reversal process Download PDFInfo
- Publication number
- US2291834A US2291834A US280348A US28034839A US2291834A US 2291834 A US2291834 A US 2291834A US 280348 A US280348 A US 280348A US 28034839 A US28034839 A US 28034839A US 2291834 A US2291834 A US 2291834A
- Authority
- US
- United States
- Prior art keywords
- layer
- layers
- blue
- color
- exposure
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title description 10
- 239000000463 material Substances 0.000 description 8
- 235000005811 Viola adunca Nutrition 0.000 description 7
- 240000009038 Viola odorata Species 0.000 description 7
- 235000013487 Viola odorata Nutrition 0.000 description 7
- 235000002254 Viola papilionacea Nutrition 0.000 description 7
- 239000004332 silver Substances 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- UJMBCXLDXJUMFB-GLCFPVLVSA-K tartrazine Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)C1=NN(C=2C=CC(=CC=2)S([O-])(=O)=O)C(=O)C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 UJMBCXLDXJUMFB-GLCFPVLVSA-K 0.000 description 2
- 239000004149 tartrazine Substances 0.000 description 2
- 229960000943 tartrazine Drugs 0.000 description 2
- 235000012756 tartrazine Nutrition 0.000 description 2
- 244000172533 Viola sororia Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- -1 silver halide Chemical class 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- G03C7/18—Processes for the correction of the colour image in subtractive colour photography
Definitions
- This invention relates to an improvement in the color photographic reversal processes.
- Our present invention has for an object to provide a process in which the yellow filter layers are omitted and after the first development and before the second exposure the light sensitive layers are colored yellow.
- the second exposure there may be used for example controlled blue-Violet light.
- an exposed multi-layer film the layers of which are respectively blue-sensitive, green-sensitive and red-sensitive is in the first place subjected to a first development in a blackand-white developer and after removing the silver is thoroughly washed.
- the film is then treated in a solution of a yellow dyestuff, for example tartrazine so that all layers are dyed yellow and is then caused to travel in such a manner that for the second exposure blue-violet light may act both on the layer side and on the support side.
- the intensity of this blue-violet light is controlled in accordance with the necessary color correction by electrical resistances or diaphragms.
- WALTER SCI-BULZ. WALTER. RAHTS.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2291834X | 1938-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2291834A true US2291834A (en) | 1942-08-04 |
Family
ID=7993817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US280348A Expired - Lifetime US2291834A (en) | 1938-06-21 | 1939-06-21 | Color photographic reversal process |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2291834A (fr) |
| FR (1) | FR856630A (fr) |
-
1939
- 1939-06-19 FR FR856630D patent/FR856630A/fr not_active Expired
- 1939-06-21 US US280348A patent/US2291834A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR856630A (fr) | 1940-07-29 |
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