DE422297C - Process for the production of a selenium bath for photographic silver-containing developing and copying papers - Google Patents
Process for the production of a selenium bath for photographic silver-containing developing and copying papersInfo
- Publication number
- DE422297C DE422297C DEST39378D DEST039378D DE422297C DE 422297 C DE422297 C DE 422297C DE ST39378 D DEST39378 D DE ST39378D DE ST039378 D DEST039378 D DE ST039378D DE 422297 C DE422297 C DE 422297C
- Authority
- DE
- Germany
- Prior art keywords
- selenium
- bath
- production
- photographic silver
- copying papers
- 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
- G03C5/40—Chemically transforming developed images
- G03C5/46—Toning
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
Verfahren zur Herstellung eines Selentonbades für photographische silberhaltige Entwicklungs- und Kopierpapiere.Process for the preparation of a selenium bath for photographic use silver-containing developing and copying papers.
Zusatz zum Patent 419428. Nach dem Hauptpatent 4I9428 wird die Herstellung des Selentonbades bei Anwesenheit von Soda in der wässerigen Selenaufschwemmung ausgeführt, und zwar mit Vorteil bei erhöhter Temperatur.Addition to patent 419428. After the main patent 4I9428 the production the selenium bath in the presence of soda in the aqueous selenium suspension carried out, and with advantage at an elevated temperature.
Es hat sich gezeigt, daß mit demselben und teils noch besseren Erfolgen auch andere alkalisch reagierende Stoffe Verwendung finden können, z. B. Natriumsulfit, Ammoniak, organische Ammoniumbasen und auch Alkalien wie Atznatron und Ätzkalilösungen. Sehr günstige Tonwirkungen können durch geeignete Mischungen der alkalischen Bestandteile erzielt werden. Dabei ist es gleich-. -gültig, ob die alkalischen Reagenzien der Selenaufschwemmung oder der Hydrosulfitlösung oder beiden Lösungen zugesetzt werden.It has been shown that with the same and sometimes even better results other alkaline substances can also be used, e.g. B. sodium sulfite, Ammonia, organic ammonium bases and also alkalis such as caustic soda and caustic potash solutions. Very beneficial clay effects can be achieved by suitable mixtures of the alkaline components be achieved. It is the same. -valid whether the alkaline reagents of the Selenium suspension or the hydrosulfite solution or both solutions can be added.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST39378D DE422297C (en) | 1924-11-10 | 1924-11-11 | Process for the production of a selenium bath for photographic silver-containing developing and copying papers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST039378 | 1924-11-10 | ||
DEST39378D DE422297C (en) | 1924-11-10 | 1924-11-11 | Process for the production of a selenium bath for photographic silver-containing developing and copying papers |
Publications (1)
Publication Number | Publication Date |
---|---|
DE422297C true DE422297C (en) | 1925-11-27 |
Family
ID=25994555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEST39378D Expired DE422297C (en) | 1924-11-10 | 1924-11-11 | Process for the production of a selenium bath for photographic silver-containing developing and copying papers |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE422297C (en) |
-
1924
- 1924-11-11 DE DEST39378D patent/DE422297C/en not_active Expired
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