DE419428C - 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
- DE419428C DE419428C DEST38191D DEST038191D DE419428C DE 419428 C DE419428 C DE 419428C DE ST38191 D DEST38191 D DE ST38191D DE ST038191 D DEST038191 D DE ST038191D DE 419428 C DE419428 C DE 419428C
- Authority
- DE
- Germany
- Prior art keywords
- selenium
- bath
- production
- copying papers
- photographic silver
- 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)
- Paper (AREA)
Description
Verfahren zur Herstellung eines Selentonbades für photographische silberhaltige Entwicklungs- und Kopierpapiere. Verfahren zur Herstellung eines Selentonbades für photographische silberhaltige Entwicklungs- und Kopierpapiere. Die Erfindung betrifft die Herstellung eines Tonbades mit metalloidem Selen.Process for the preparation of a selenium bath for photographic use silver-containing developing and copying papers. Process for the production of a selenium bath for photographic developing and copying papers containing silver. The invention concerns the production of a clay bath with metalloid selenium.
Es ist bekannt, daß durch Lösen von Selen in Natriumsulfit eine brauchbare Tonungslüssigkeit für Entwicklungs- und Kopierpapiere entsteht. Die Löslichkei: des Selens in Sulfiten ist jedodli gering, und an eine weitere Verdünnung des an sich schon langsam arbeitenden Toners kann nach Ansicht des Erfinders nicht gedacht werden.It is known that by dissolving selenium in sodium sulfite a useful Toning liquid for developing and copying papers is created. The solubility: the selenium in sulphites is little, however, and a further dilution of the an According to the inventor, toner that is already working slowly cannot be thought of will.
Es wurde nun beobachtet, daß man erheblich stärkere Tonbäder mit Selen dadurch erhalten kann, wenn man das kolloide oder amorphe Selen des Handels mit Soda und Natriuanhydrosulfit kocht.It has now been observed that considerably stronger clay baths with selenium are used can be obtained by using the colloidal or amorphous selenium of the trade Soda and sodium hydrosulfite boil.
Man kocht also das Selen mit einer starken Sodalösu;ng und gibt in die kochende oder heiße Lösung Natriumhydrosulfit, bis alles Selen sieh zu einer grünbraunen Flüssigkeit gelöst hat.So you boil the selenium with a strong soda solution and give in the boiling or hot sodium hydrosulfite solution until all of the selenium looks to one green-brown liquid has dissolved.
Es ist hervorzuheben, daß durch das Kochen des Hydrosulfi:s bzw. Einbringen in eine heiße Sololösung eine Umsetzung stattfindet, die nicht darin bestehen kann, daß nur Sulfit und Thiosulfat entsteht, denn in der gemischten Lösung dieser beiden Salze löst sieh das Selen selbst beim Kochen nur ganz unbeträchtlich, und es entsteht eine rötlich klare Lösung, wenn vom Bodensatz abfiltriert wird. Auch löst Sulfit bzw. Thiosulfat oder das Gemisch beider nicht so spontan wie heiße Hydrosulfit-Sodalösung, was wiederum, neben der ganz spezifischen Farbe des neuen Präparates, für ein durchaus selbständiges Verfahren spricht.It should be emphasized that by boiling the hydrosulfi: s or introducing a conversion takes place in a hot solo solution that cannot consist of that only sulphite and thiosulphate arise, because in the mixed solution of these two The selenium itself only dissolves salts insignificantly when it is cooked, and it is formed a reddish clear solution if the sediment is filtered off. Sulphite also dissolves or thiosulphate or a mixture of both not as spontaneous as hot hydrosulphite soda solution, which in turn, in addition to the very specific color of the new preparation, for an absolutely independent procedure speaks.
Viel weniger gut löst sich Selen in kalter Hydrosulfit- und Hydrosulfit-Sodalösung. Tonbäder aus Natriumselenosulfat, unterschwefligsaurem Salz und einem mindestens das Zehnfache betragenden Gehalt an Nat:riumhydrosulfit sind bekannt.Selenium dissolves much less well in cold hydrosulfite and hydrosulfite soda solution. Clay baths made from sodium selenosulphate, hyposulphurous salt and at least one ten times the content of sodium hydrosulphite are known.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST38191D DE419428C (en) | 1924-07-16 | 1924-07-17 | 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 |
---|---|---|---|
DEST038191 | 1924-07-16 | ||
DEST38191D DE419428C (en) | 1924-07-16 | 1924-07-17 | Process for the production of a selenium bath for photographic silver-containing developing and copying papers |
Publications (1)
Publication Number | Publication Date |
---|---|
DE419428C true DE419428C (en) | 1925-09-29 |
Family
ID=25994539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEST38191D Expired DE419428C (en) | 1924-07-16 | 1924-07-17 | Process for the production of a selenium bath for photographic silver-containing developing and copying papers |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE419428C (en) |
-
1924
- 1924-07-17 DE DEST38191D patent/DE419428C/en not_active Expired
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