US710568A - Photographic fixing-bath. - Google Patents
Photographic fixing-bath. Download PDFInfo
- Publication number
- US710568A US710568A US10870302A US1902108703A US710568A US 710568 A US710568 A US 710568A US 10870302 A US10870302 A US 10870302A US 1902108703 A US1902108703 A US 1902108703A US 710568 A US710568 A US 710568A
- Authority
- US
- United States
- Prior art keywords
- bath
- photographic fixing
- elberfeld
- sulfites
- fixing
- 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 - Lifetime
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
- G03C5/38—Fixing; Developing-fixing; Hardening-fixing
Definitions
- neutral acid sulfites and thio- IQ sulfates of alkalies are employed in photography as admixtures to photographic fixing-baths.
- the use of these sulfites is, how ever, accompanied by many disadvantages. For instance, the solutions cannot be pre- 1 served for any length of time without becoming cloudy, and the sulfites are decomposed by the action of the air, precipitates being thus formed which spoil the photographic pictures immersed in them.
- M meaning an alkali metal, such as potassium or sodium.
- the following formula can be employed with good effect as a fixing-bath: one hundred parts of sodium thiosulfate, four parts of potassium acetone bisulfite, and four hundred parts of water.
- the fixing agent produced as above will keep for an extraordinarily long time and can be used over and over again, as it remains clear, as well as colorless, for a very long time. 5
Description
UNITED STATES PATENT OFFICE.
ARTHUR EIOHENGRUN, OF ELBERFELD, GERMANY, ASSIGNOR TO FARBEN- FABRIKEN OF ELBERFELD 00., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.
PHOTOGRAPHIC FIXING-BATH.
SPECIFICATION forming part of Letters Patent No. 710,568, dated October '7, 1902. Application filed May 28,1902. Serial No. 108.703. (No specimens.)
To a whom it may concern:
Be it known that I, ARTHUR EIonENcEiiN, doctor of philosophy, chemist, residing at Elberfeld, Germany, (assignor to the FARBEN- FABRIKEN OF ELBERFELD Co. of New York,) have invented a certain new and useful Improvement in Photographic Fixing-Baths, of which the following is a specification.
As is known, neutral acid sulfites and thio- IQ sulfates of alkalies are employed in photography as admixtures to photographic fixing-baths. The use of these sulfites is, how ever, accompanied by many disadvantages. For instance, the solutions cannot be pre- 1 served for any length of time without becoming cloudy, and the sulfites are decomposed by the action of the air, precipitates being thus formed which spoil the photographic pictures immersed in them. I have now found that these disadvantages can be obviated by employing instead of the above-mentioned sulfites the addition compounds obtained from ketones and bisulfites, especially the compounds which are prepared from acetone 2 and the potassium or sodium bisulfites, the so-called acetone alkali bisulfites having the following general formula:
CH OH C 3 011 so,M,
M meaning an alkali metal, such as potassium or sodium. These addition compounds have the great advantage that they are readily soluble in water and that even their concentrated solutions keep long in a well-corked bottle without decomposing.
The following formula can be employed with good effect as a fixing-bath: one hundred parts of sodium thiosulfate, four parts of potassium acetone bisulfite, and four hundred parts of water.
The fixing agent produced as above will keep for an extraordinarily long time and can be used over and over again, as it remains clear, as well as colorless, for a very long time. 5
Having thus described my invention and in what manner the same is to be performed, what I claim as new, and desire to secure by Letters Patent, is-
The herein-described new fixing agent containing aceton e alkali bisulfite and alkali thiosulfate, substantially as hereinbefore described.
In testimony whereof I have signed my name in the presence of two subscribing witnesses.
ARTHUR EIOHENGRUN.
'Witnesses:
Orro Konrc, T. A. RITTERHAUS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10870302A US710568A (en) | 1902-05-23 | 1902-05-23 | Photographic fixing-bath. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10870302A US710568A (en) | 1902-05-23 | 1902-05-23 | Photographic fixing-bath. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US710568A true US710568A (en) | 1902-10-07 |
Family
ID=2779094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10870302A Expired - Lifetime US710568A (en) | 1902-05-23 | 1902-05-23 | Photographic fixing-bath. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US710568A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3212895A (en) * | 1960-12-20 | 1965-10-19 | Eastman Kodak Co | Stability of rapid-processed photographic materials |
-
1902
- 1902-05-23 US US10870302A patent/US710568A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3212895A (en) * | 1960-12-20 | 1965-10-19 | Eastman Kodak Co | Stability of rapid-processed photographic materials |
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