US1760756A - Process of desensitizing silver-bromide emulsions and plates or films covered with such emulsions - Google Patents
Process of desensitizing silver-bromide emulsions and plates or films covered with such emulsions Download PDFInfo
- Publication number
- US1760756A US1760756A US241447A US24144727A US1760756A US 1760756 A US1760756 A US 1760756A US 241447 A US241447 A US 241447A US 24144727 A US24144727 A US 24144727A US 1760756 A US1760756 A US 1760756A
- Authority
- US
- United States
- Prior art keywords
- emulsions
- desensitizing
- plates
- silver
- bromide
- 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
- 239000000839 emulsion Substances 0.000 title description 6
- 238000000034 method Methods 0.000 title description 6
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 title description 6
- 150000001875 compounds Chemical class 0.000 description 5
- OARRHUQTFTUEOS-UHFFFAOYSA-N safranin Chemical compound [Cl-].C=12C=C(N)C(C)=CC2=NC2=CC(C)=C(N)C=C2[N+]=1C1=CC=CC=C1 OARRHUQTFTUEOS-UHFFFAOYSA-N 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 108010010803 Gelatin Proteins 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229920000159 gelatin Polymers 0.000 description 3
- 239000008273 gelatin Substances 0.000 description 3
- 235000019322 gelatine Nutrition 0.000 description 3
- 235000011852 gelatine desserts Nutrition 0.000 description 3
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 101100020619 Arabidopsis thaliana LATE gene Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- SOUHUMACVWVDME-UHFFFAOYSA-N safranin O Chemical compound [Cl-].C12=CC(N)=CC=C2N=C2C=CC(N)=CC2=[N+]1C1=CC=CC=C1 SOUHUMACVWVDME-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- G03C5/32—Latensification; Densensitisation
Description
Patented May 27, 193% uurreo ,srArEsvParser orrica IBENNO EoMoLKA, DECEASED, LATE OF ERANKEoRr-oN-rHE-MAIN, GERMANY; BY
RUDOLF ROSENTHAL, EXECUTOR, 0F ERANK oREoN-rRE-MAIN, GERMANY, As- SIGNOR .ro '1. o. EARRENINnUs'rRI AKTIENeEs LLscHAEr, 0F ERANxEoR'r-oN- THE-MAIN, GERMANY, A CORPORATION OF GERMANY PROCESS OF DESENSITIZING SILVER-BROMIDE EMULSIONS AE'D PLATES OR FILMS COVERED WITH SUCH EMULSIONS No Drawing. Application filed December 20, 1927,
NH 3 i 6 M 5 in which Ac means the residue of an acid, that is to say 3-6-diamino-phenyhphcnazonium salts, forinstance the pheno-safranine and tolu-safranine, have the property of desensitizing photographic silver-bromide emulsions in such a degree that they can be developed in yellow light. The said dyestuffs have, however, the disadvantage that they stain the gelatin layer of the plates and films, the vessels and also the fingers and clothes of the operators, intensely red. Though in the case of photographic plates this color can be removed from their gelatin layer, this cannot be done with films, because the latter, when treated with safranine dyestuffs, are stained so much that they are entirely spoiled thereby and rendered unfit for use. For this reason the process of desensitizing by means of safranines cannot be applied in developing films.
The inventor has now found that the isomerides of the said safranine dyestufi's in which at least two amino groups are situated in one and the same carbon nucleus belonging to the azine complex, have a very strong desensitizing action upon photographic silver bromide emulsions. These compounds offer the advantage over the normal safranine dyestuffs that, in spite of their pronounced dyestuff character, they do not stain at all,
Serial No. 241,447, and in Germany. June 15, 1927.
or only very slightly, the gelatin layers, the fingers of the operator etc., so that the fihns or other materials are not spoiled, and the slight coloring imparted to them can be easily washed out by means of water. =For instance the following compounds of the said kind are suitable for producing this efl'ect:
in which Ac represents the residue of an acid (see Berichte der Deutschen Chem. Ges. Vol. 33 page 3074) the 2-3-diamino-phenyl-phenaz'onium salts of the formula:
in which Ac represents the residue of an acid (see'Helveti'ca Chimica Acta VIII page 27 9) and also the homologues and substitution products thereof, for instance the alkyl-, halogen-, amino-oxyalkyl derivatives or the like. v The photographic layers may be desensitized either by immersing the plates or films, before they are developed, for l-2 minutes into the solution of the iso-diamino-phenylphenazonium salt or by adding a small quantity of this compound to the developer.
The following examples serve to illustrate 1. The plate immersed into 1:5000) the invention but they are not intended to limit it thereto.
or film to be developed is an aqueous solution (about of 1-3-diamino-phenyl-phenazonium-chloride for about 1-2 minutes and the development can then be eflected in yellow 2. About 100 light or in candle light.
ccm. of the'developer are mixed with 2 com. of a solution (1:500) of 1 3 -diamino-phenyl-phenazonium-chloride.
After the plate in the developer development can or candle light.
3. In the processes set of the film has remained for about one minute, the be finished in yellow light forth in (Example 1) and (Example 2) there may be used 1n stead of the above named compound, for instance the following compounds: 1-3-diamino-7-aminophenyl phenazonium chloride; 2-3-diamino-phenyl-phenazonium-nitrate; 1-
3-diamino-6- (or 7 )-chlorphenyl-phenazomum-chloride; 1-3-diamino-ortho- (or para) tolyl-phenazonium-chloride of the following formula CH; (ortho) 1-3-diamino-ortho- (or p a r a) -o x y a l k y lphenyl-phenazonium-chloride; 1-3-diamino- 6-oxyalky-phenyl-phenazonium-chloride of the formula:
What is claimed is:
1. The process of desensitizing photographic silver-bromide layers, which consists in treating the phenylphenazonium two amino groups layer with an amine of a salt in which at least are situated in one and the same carbon ring belonging to the azine complex. 7
2. The process of desensitizing photographic silver-b romide layers, which consists in treating the layer with a salt of a phenylphenazonium of the following composition:
In testimony whereof, I aflix my si nature.
RUDOLF ROSENTIIAL, Executor of the Estate of Ben/no H omollaw,
Deceased.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI0031435 | 1927-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1760756A true US1760756A (en) | 1930-05-27 |
Family
ID=7187873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US241447A Expired - Lifetime US1760756A (en) | 1927-06-15 | 1927-12-20 | Process of desensitizing silver-bromide emulsions and plates or films covered with such emulsions |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1760756A (en) |
| BE (1) | BE349610A (en) |
| FR (1) | FR650786A (en) |
| GB (1) | GB292140A (en) |
| NL (1) | NL25041C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1547727B1 (en) * | 1965-08-25 | 1970-10-08 | Eastman Kodak Co | Silver halide photographic emulsion desensitized to visible light |
-
0
- NL NL25041D patent/NL25041C/xx active
- BE BE349610D patent/BE349610A/xx unknown
-
1927
- 1927-12-20 US US241447A patent/US1760756A/en not_active Expired - Lifetime
-
1928
- 1928-03-12 FR FR650786D patent/FR650786A/en not_active Expired
- 1928-05-23 GB GB15169/28A patent/GB292140A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1547727B1 (en) * | 1965-08-25 | 1970-10-08 | Eastman Kodak Co | Silver halide photographic emulsion desensitized to visible light |
Also Published As
| Publication number | Publication date |
|---|---|
| NL25041C (en) | |
| BE349610A (en) | |
| FR650786A (en) | 1929-02-11 |
| GB292140A (en) | 1928-09-13 |
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