GB1371563A - Process of desilvering of photogrphic bleach-fix baths - Google Patents

Process of desilvering of photogrphic bleach-fix baths

Info

Publication number
GB1371563A
GB1371563A GB1802272A GB1802272A GB1371563A GB 1371563 A GB1371563 A GB 1371563A GB 1802272 A GB1802272 A GB 1802272A GB 1802272 A GB1802272 A GB 1802272A GB 1371563 A GB1371563 A GB 1371563A
Authority
GB
United Kingdom
Prior art keywords
iron
bleach
reducing agent
baths
complexes
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
Application number
GB1802272A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of GB1371563A publication Critical patent/GB1371563A/en
Expired legal-status Critical Current

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
    • G03C5/395—Regeneration of photographic processing agents other than developers; Replenishers therefor
    • G03C5/3952—Chemical, mechanical or thermal methods, e.g. oxidation, precipitation, centrifugation

Abstract

1371563 De-silvering photographic baths AGFA-GEVAERT AG 19 April 1972 [27 July 1971] 18022/72 Heading C7D Spent photographic bleach-fix baths which contain oxidizing agent in the form of iron (III) complexes of aminopolyacetic acids are de-silvered by a process which involves treatment with a reducing agent before cementation with iron. In addition to oxidizing agents such as iron (III) complexes of EDTA, the bleach-fix baths generally contain a fixing agent, e.g. a thiosulphate, and other additives, e.g. pH buffers. The reducing agent may be a dithionite, phosphite, hypophosphite, borohydride, water-soluble hydrazine derivative, hydroxylamine, semicarbazide, or carbohydroxide, or is ascorbic acid or formamidine sulphinic acid; particularly preferred is sodium dithionite, Na 2 S 2 O 4 . The reducing agent reduces the iron complex contained in the bath so that cementation of the silver with e.g. steel wool can be effected.
GB1802272A 1971-07-27 1972-04-19 Process of desilvering of photogrphic bleach-fix baths Expired GB1371563A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712137549 DE2137549C3 (en) 1971-07-27 1971-07-27 Process for the desilvering of photographic bleach-fix baths

Publications (1)

Publication Number Publication Date
GB1371563A true GB1371563A (en) 1974-10-23

Family

ID=5814967

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1802272A Expired GB1371563A (en) 1971-07-27 1972-04-19 Process of desilvering of photogrphic bleach-fix baths

Country Status (6)

Country Link
JP (1) JPS5528058B1 (en)
BE (1) BE785959A (en)
DE (1) DE2137549C3 (en)
FR (1) FR2147023B1 (en)
GB (1) GB1371563A (en)
IT (1) IT952706B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209520A1 (en) * 2000-11-28 2002-05-29 Eastman Kodak Company Ferrous photographic bleach-fixing precursor compositions and methods for their use
WO2022087676A1 (en) * 2020-10-30 2022-05-05 Clean Mining Pty Ltd Process for recovering precious metal from an aqueous solution

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55131141A (en) * 1979-04-01 1980-10-11 Hiroyoshi Machida Recovering method for silver in photographic bleach-fix bath
EP0338990A3 (en) * 1988-04-21 1990-07-25 Ilford Ag Process for desilverising fixing baths containing iodide

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209520A1 (en) * 2000-11-28 2002-05-29 Eastman Kodak Company Ferrous photographic bleach-fixing precursor compositions and methods for their use
US6582893B2 (en) 2000-11-28 2003-06-24 Eastman Kodak Company Ferrous photographic bleach-fixing precursor compositions and methods for their use
WO2022087676A1 (en) * 2020-10-30 2022-05-05 Clean Mining Pty Ltd Process for recovering precious metal from an aqueous solution

Also Published As

Publication number Publication date
FR2147023B1 (en) 1974-10-04
DE2137549A1 (en) 1973-02-08
JPS5528058B1 (en) 1980-07-25
DE2137549C3 (en) 1974-10-31
BE785959A (en) 1973-01-08
IT952706B (en) 1973-07-30
FR2147023A1 (en) 1973-03-09
DE2137549B2 (en) 1974-04-04

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee