AT95081B

AT95081B - Process for regenerating photographic fixers.

Info

Publication number: AT95081B
Authority: AT
Inventors: Bruno Ing Thomas
Original assignee: Bruno Ing Thomas
Priority date: 1920-12-07
Filing date: 1921-07-12
Publication date: 1923-11-26

Description

  

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  Verfahren zur Regenerierung   photographischer Fixiernittel.   
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Da das hiebei entstehende Natriumsulfit im Fixierbad bis zu hohen Konzentrationen vorhanden sein kann, ist der wiederholten Wiederverwendung des regenerierten und in dieser Weise vom unverbrauchten Schwefelnatrium befreiten Fixiermittels nur dadurch ein Ziel gesetzt, dass nach sehr langem Gebrauch schliesslich die Dichte der Lösung zu hoch wird. Der ausgeschiedene Schwefel kann von Zeit zu Zeit abfiltriert werden. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



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  Process for regenerating photographic fixing agents.
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Since the sodium sulphite that is produced in this way can be present in the fixer in high concentrations, the only goal of repeated reuse of the regenerated fixer, which has been freed from unused sodium sulphide, is that after a very long period of use, the density of the solution becomes too high. The precipitated sulfur can be filtered off from time to time.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims

PATENT CLAIM: Process for the regeneration of photographic fixing agents after recovery of the noble metals by precipitation with sulfides according to Patent No. 94401, characterized in that the unused sulfide is broken down in a manner known per se by the action of sulfurous acid, in particular in the form of bisulfites. ** WARNING ** End of CLMS field may overlap beginning of DESC **.