US2017295A - Photographic developer - Google Patents
Photographic developer Download PDFInfo
- Publication number
- US2017295A US2017295A US739279A US73927934A US2017295A US 2017295 A US2017295 A US 2017295A US 739279 A US739279 A US 739279A US 73927934 A US73927934 A US 73927934A US 2017295 A US2017295 A US 2017295A
- Authority
- US
- United States
- Prior art keywords
- pyrogallol
- photographic developer
- developer
- ether
- photographic
- 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
- G03C5/29—Development processes or agents therefor
- G03C5/30—Developers
-
- 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
- G03C5/29—Development processes or agents therefor
- G03C5/30—Developers
- G03C5/3021—Developers with oxydisable hydroxyl or amine groups linked to an aromatic ring
Definitions
- pyrogallol monomethyl ether possesses the advantages of pyrogallol as a photographic developer while at the same time being free from the disadvantage of high sensitiveness to oxygen. With the present developer, perfectly clear unfaded negatives can be produced.
- a photographic developer is prepared with 5 about 100 parts by weight of water, about 65 parts by weight of sodium sulflte and about 1.7 parts by weight of potassium pyrosulflte. To this solution about 1.7 parts by weight of pyrogallol monomethyl ether or pyrogallol monoethyl ether are added.
- Solution B A solution is made by dissolving about parts by weight of soda crystals (sodium car- 5 bonate) to about 100 parts by weight of water.
- pyrogallol monomethyl ether can be easily produced by partially. demethylating the dimethyl ether according to known method. It is likewise possible to convert pyrogallol into monoethyl ether 'by treating it with dimethyl sulfate. A very good yield:1 may be obtained in this latter process.
- a photographic developer containing a pyrogallol monoalkyl ether containing a pyrogallol monoalkyl ether.
- a photographic developer containing mon0- -methyl' ether of methyl pyrogallol 4.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Patented a. 15, 1935- UNITED STATES PATENT) OFFICE 2,017,295 riio'roeaarmc DEVELOPER velopers became developers could period of time.
been made to overcome the aforesaid Hermann Schiiltes,
assignor to Deutsche Golddeanstalt vormals Boessler,
Mainz-Mombach, Germany,
and Silber-Schei- FrankIort-on-the- Main, Germany, a German company No Drawing. Application Angnst 10, 1934, Serial No. 739,279. In
Germany December 8, 1933 4 Claims. (Cl. 95-88) g dark; As a result such prior not be kept very well for along Although many attempts have tage, no attempt, as far as I am aware, has been wholly satisfactory and successful when carried into practice on a. commercial and practical scale.
I have discovered a photographic developer which overcomes the aforesaid disadvantages of prior developers and which possesses many advantages.
It is an object of the invention to provide a photographic developer which is not highly sensitive to oxygen and which produces a clear, un-
faded negative.
It is also within the contemplation of the invention to provide a photographic developer which is wholly satisfactory in practical use and which is commercial and is 'capableof being manufactured on an industrial scale.
Other objects and advantages of the invention will become apparent from the following description.
According to the present discovery, it has been found that pyrogallol monomethyl ether possesses the advantages of pyrogallol as a photographic developer while at the same time being free from the disadvantage of high sensitiveness to oxygen. With the present developer, perfectly clear unfaded negatives can be produced.
It has likewise been discovered that homelogues of wrogallol monomethyl ether can also be used as photographic developers. Thus; for instance, monoethyl ether of pyrogallol or monomethyl ether of methyl pyro allol canbe' employed instead of pyrogallol monomethyl ether.
For. the
PHIPQ E of Giving those skilled in the disadvanart a better understanding brine iri viition, the r following specific and illustrative example is giv- Solution A A photographic developer is prepared with 5 about 100 parts by weight of water, about 65 parts by weight of sodium sulflte and about 1.7 parts by weight of potassium pyrosulflte. To this solution about 1.7 parts by weight of pyrogallol monomethyl ether or pyrogallol monoethyl ether are added.
Solution B A solution is made by dissolving about parts by weight of soda crystals (sodium car- 5 bonate) to about 100 parts by weight of water.
About equal volumes of Solution A, of Solution 13 and of water are mixed together to give-a developer. The recipe and the handling of the developer is essentially the same as that of pyro- 20 gallol.
It is to be observed that the present invention is a surprising discovery which could not. have been predicted by those skilled in the art. This is particularly true because prior experiments have shown that pyrogallol 1.3 dimethyl ether is practically ineffective as a developer.
Furthermore, it is to be noted that pyrogallol monomethyl ether can be easily produced by partially. demethylating the dimethyl ether according to known method. It is likewise possible to convert pyrogallol into monoethyl ether 'by treating it with dimethyl sulfate. A very good yield:1 may be obtained in this latter process.
I aim:
l. A photographic developer containing a pyrogallol monoalkyl ether.
4. A photographic developer containing mon0- -methyl' ether of methyl pyrogallol.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED0067090 | 1933-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2017295A true US2017295A (en) | 1935-10-15 |
Family
ID=7059637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US739279A Expired - Lifetime US2017295A (en) | 1933-12-08 | 1934-08-10 | Photographic developer |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2017295A (en) |
| FR (1) | FR781877A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3775124A (en) * | 1971-06-14 | 1973-11-27 | Fuji Photo Film Co Ltd | Stabilizing method and composition for color photographic processing |
-
1934
- 1934-08-10 US US739279A patent/US2017295A/en not_active Expired - Lifetime
- 1934-11-26 FR FR781877D patent/FR781877A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3775124A (en) * | 1971-06-14 | 1973-11-27 | Fuji Photo Film Co Ltd | Stabilizing method and composition for color photographic processing |
Also Published As
| Publication number | Publication date |
|---|---|
| FR781877A (en) | 1935-05-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS5720734A (en) | Heat developing photosensitive material | |
| US2017295A (en) | Photographic developer | |
| US2266430A (en) | Etching solution | |
| JPS55126241A (en) | Developing solution for silver halide color photographic material | |
| JPS5567747A (en) | Developing solution for silver halide color photographic material | |
| JPS57132146A (en) | Method for processing color photographic material | |
| GB920277A (en) | A process for the production of photographic silver images | |
| US2234692A (en) | Process of making p-nitrosophenol | |
| US2531091A (en) | N-acetonyl-pyridinium chloride as an azo coupling component in diazotypes | |
| US2017167A (en) | Photographic developer | |
| CH448742A (en) | Apparatus for the production of photographic copies by reflex exposure | |
| GB506450A (en) | Improvements in or relating to photographic bleaches | |
| US2805265A (en) | Aralkyl halide stabilizers | |
| JPS54114241A (en) | Silver halide photographic material | |
| JPS541020A (en) | Silver halide photographic material | |
| US2206572A (en) | Photographic toning with ferricyanides | |
| US2962364A (en) | Process and composition for developing images and designs on metal | |
| GB879443A (en) | Bleach solutions for use in photography | |
| GB1195776A (en) | Thallium-containing Derivatives of Peptides | |
| US2155501A (en) | Photographic treating bath | |
| GB810081A (en) | Processing photographic diazotype materials | |
| Hartung | CCCLXVIII.—Studies with the microbalance. Part II. The photochemical decomposition of silver chloride | |
| SU367405A1 (en) | ALL-UNION | |
| JPS54111827A (en) | Processing method for silver halide color photographic material | |
| GB972971A (en) | Novel benzophenones and the preparation thereof |