GB175988A - A method of transforming photographic silver images into tanned gelatine images - Google Patents
A method of transforming photographic silver images into tanned gelatine imagesInfo
- Publication number
- GB175988A GB175988A GB5256/22A GB525622A GB175988A GB 175988 A GB175988 A GB 175988A GB 5256/22 A GB5256/22 A GB 5256/22A GB 525622 A GB525622 A GB 525622A GB 175988 A GB175988 A GB 175988A
- Authority
- GB
- United Kingdom
- Prior art keywords
- image
- gelatine
- tanned
- images
- bichromate
- 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
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/29—Development processes or agents therefor
- G03C5/315—Tanning development
Abstract
175,988. Schrott, P. Feb. 23, 1921, [Convention date]. Void [Published under Sect. 91 of the Act]. Chromo-gelatine processes; toning and after treatment; photo-mechanical printing-surfaces. -To transform a silver image into a tanned gelatine image by hardening the gelatine in the presence of the image by a bichromate, the silver image is first treated in a bath, such as copper bromide or chloride or silver ferrocyanide, to obtain a compound metal image which acts as a reducing-agent to a bichromate, and the image is then treated in the bichromate bath. A yellow image is formed which is an indication that the tanning is complete. The metal image can be dissolved out by acid leaving a clear tanned gelatine image which can then be coloured by dyes, or a greasy printing colouring-matter can be used and the image used as a phototype.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT175988X | 1921-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB175988A true GB175988A (en) | 1923-08-22 |
Family
ID=3658605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5256/22A Expired GB175988A (en) | 1921-02-23 | 1922-02-23 | A method of transforming photographic silver images into tanned gelatine images |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE353835C (en) |
| FR (1) | FR547712A (en) |
| GB (1) | GB175988A (en) |
-
1921
- 1921-10-13 DE DE1921353835D patent/DE353835C/en not_active Expired
-
1922
- 1922-02-21 FR FR547712D patent/FR547712A/en not_active Expired
- 1922-02-23 GB GB5256/22A patent/GB175988A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE353835C (en) | 1922-05-23 |
| FR547712A (en) | 1922-12-22 |
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