GB687311A - Regeneration of exhausted photographic silver bleaching solutions - Google Patents
Regeneration of exhausted photographic silver bleaching solutionsInfo
- Publication number
- GB687311A GB687311A GB31394/50A GB3139450A GB687311A GB 687311 A GB687311 A GB 687311A GB 31394/50 A GB31394/50 A GB 31394/50A GB 3139450 A GB3139450 A GB 3139450A GB 687311 A GB687311 A GB 687311A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- sodium
- bromide
- exhausted
- bleaching solution
- 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
- G03C5/395—Regeneration of photographic processing agents other than developers; Replenishers therefor
- G03C5/3952—Chemical, mechanical or thermal methods, e.g. oxidation, precipitation, centrifugation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
687,311. Regenerating photographic bleaching solutions. GENERAL ANILINE & FILM CORPORATION. Dec. 27, 1950 [Dec. 30, 1949], No. 31394/50. Class 98 (ii). An exhausted photographic bleaching solution containing an alkali metal ferricyanide, ferrocyanide ions, and an alkali metal bromide is regenerated by adding thereto an amount of a terminal primary alkylamine, an aliphatic or aromatic carbonamide or carbonimide, an aromatic sulphonamide, or melamine, in which the amino, amido, or imido nitrogen is substituted by at least one bromine atom, such that it will release about one molar equivalent of bromine for each molar equivalent of ferrocyanide ion present in the exhausted bleaching solution. An acid or acid salt (sulphuric acid, sulphamic acid, citric acid, hydrobromic acid, or an alkali bisulphate) and an additional bromide may be added to the exhausted bleaching solution. The bleaching solution may contain, in addition to the ferricyanide and bromide, a buffering agent, such as a di-alkali metal phosphate, and a corrosion preventative, such as disodium phosphate, sodium tetraphosphate, or sodium hexametaphosphate. Brominereleasing compounds specified include N-bromobutylamine, N-dibromopentylamine, N-hexabromotriethylene tetramine, N-dibromopropionamide, N-bromourea, N: N<SP>1</SP>-dibromo-N: N<SP>1</SP>- diphenylurea, N-bromophthalimide, N-tetrabromobenzene-m-disulphonamide, and N-tribromomelamine. In example 1, a mixture of sodium N-bromo-p-toluenesulphonamide and aqueous hydrobromic acid is added to an exhausted bleaching solution containing potassium ferricyanide and bromide, dibasic sodium phosphate, and sodium bisulphate. In examples 2 to 5, N-dibromobenzenesulphonamide, potassium bromide, and sodium bisulphate; N- bromoacetamide and aqueous hydrobromic acid; N-bromosuccinimide, sodium bromide, and sulphamic acid; and N-bromobenzamide and aqueous sulphuric acid are added to an exhausted bleaching solution.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US136146A US2611700A (en) | 1949-12-30 | 1949-12-30 | Regeneration of exhausted silver bleach solutions by means of n-bromo compounds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB687311A true GB687311A (en) | 1953-02-11 |
Family
ID=22471516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31394/50A Expired GB687311A (en) | 1949-12-30 | 1950-12-27 | Regeneration of exhausted photographic silver bleaching solutions |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2611700A (en) |
| BE (1) | BE500365A (en) |
| DE (1) | DE873654C (en) |
| FR (1) | FR1034731A (en) |
| GB (1) | GB687311A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2993745A (en) * | 1956-07-27 | 1961-07-25 | Mangels Herold Company Inc | Method of and compositions for bleaching in acid solutions |
| BE567236A (en) * | 1957-05-15 | |||
| BE569085A (en) * | 1957-07-05 | |||
| US2978352A (en) * | 1957-07-25 | 1961-04-04 | Du Pont | Production of triarylmethane colors |
| NL282899A (en) * | 1961-09-06 | |||
| US3256092A (en) * | 1962-03-05 | 1966-06-14 | Gen Aniline & Film Corp | Corrosion inhibitors in bleach solutions |
| US3770437A (en) * | 1972-04-06 | 1973-11-06 | D Brugger | Photographic bleach compositions |
| JPS5143312B2 (en) * | 1972-10-23 | 1976-11-20 | ||
| JPS49117037A (en) * | 1973-03-09 | 1974-11-08 | ||
| US3912514A (en) * | 1973-05-21 | 1975-10-14 | Hunt Chem Corp Philip A | Method of regenerating a spent photographic silver bleach solution |
| JPS5151350A (en) * | 1974-10-30 | 1976-05-06 | Fuji Photo Film Co Ltd |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2515930A (en) * | 1946-05-04 | 1950-07-18 | Pavelle Color Inc | Regeneration of photographic silver bleach solution |
-
0
- BE BE500365D patent/BE500365A/xx unknown
-
1949
- 1949-12-30 US US136146A patent/US2611700A/en not_active Expired - Lifetime
-
1950
- 1950-12-27 GB GB31394/50A patent/GB687311A/en not_active Expired
- 1950-12-30 FR FR1034731D patent/FR1034731A/en not_active Expired
- 1950-12-31 DE DEG4931A patent/DE873654C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE873654C (en) | 1953-04-16 |
| US2611700A (en) | 1952-09-23 |
| FR1034731A (en) | 1953-07-30 |
| BE500365A (en) |
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