GB1371563A – Process of desilvering of photogrphic bleach-fix baths
– Google Patents
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
1971-07-27
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.)
1971-07-27
Filing date
1972-04-19
Publication date
1974-10-23
1972-04-19
Application filed by Agfa Gevaert AG
filed
Critical
Agfa Gevaert AG
1974-10-23
Publication of GB1371563A
publication
Critical
patent/GB1371563A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
0
BE
BE785959D
patent/BE785959A/en
unknown
1971
1971-07-27
DE
DE19712137549
patent/DE2137549C3/en
not_active
Expired
1972
1972-04-18
IT
IT4970872A
patent/IT952706B/en
active
1972-04-19
GB
GB1802272A
patent/GB1371563A/en
not_active
Expired
1972-04-19
FR
FR7213821A
patent/FR2147023B1/fr
not_active
Expired
1972-04-20
JP
JP3923172A
patent/JPS5528058B1/ja
active
Pending
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
DE2137549A1
(en)
1973-02-08
DE2137549C3
(en)
1974-10-31
DE2137549B2
(en)
1974-04-04
FR2147023B1
(en)
1974-10-04
BE785959A
(en)
1973-01-08
JPS5528058B1
(en)
1980-07-25
FR2147023A1
(en)
1973-03-09
IT952706B
(en)
1973-07-30
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(en)
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(en)
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Legal Events
Date
Code
Title
Description
1975-03-05
PS
Patent sealed
1978-08-09
746
Register noted ‘licences of right’ (sect. 46/1977)
1983-12-07
PCNP
Patent ceased through non-payment of renewal fee
