GB532895A - Improvements in desensitisation of photographic emulsions - Google Patents
Improvements in desensitisation of photographic emulsionsInfo
- Publication number
- GB532895A GB532895A GB23472/39A GB2347239A GB532895A GB 532895 A GB532895 A GB 532895A GB 23472/39 A GB23472/39 A GB 23472/39A GB 2347239 A GB2347239 A GB 2347239A GB 532895 A GB532895 A GB 532895A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alkali
- free base
- itself
- unsubstituted compound
- developing 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
- 239000000839 emulsion Substances 0.000 title abstract 2
- 238000000586 desensitisation Methods 0.000 title 1
- 239000003513 alkali Substances 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 abstract 2
- 239000012458 free base Substances 0.000 abstract 2
- OVFJHQBWUUTRFT-UHFFFAOYSA-N 1,2,3,4-tetrahydrotetrazine Chemical compound C1=CNNNN1 OVFJHQBWUUTRFT-UHFFFAOYSA-N 0.000 abstract 1
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 abstract 1
- 125000002252 acyl group Chemical group 0.000 abstract 1
- 125000000217 alkyl group Chemical group 0.000 abstract 1
- 125000003710 aryl alkyl group Chemical group 0.000 abstract 1
- 125000003118 aryl group Chemical group 0.000 abstract 1
- 125000004429 atom Chemical group 0.000 abstract 1
- CREXVNNSNOKDHW-UHFFFAOYSA-N azaniumylideneazanide Chemical group N[N] CREXVNNSNOKDHW-UHFFFAOYSA-N 0.000 abstract 1
- 239000002585 base Substances 0.000 abstract 1
- 125000003236 benzoyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C(*)=O 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 abstract 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract 1
- 125000000286 phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 abstract 1
- 125000001501 propionyl group Chemical group O=C([*])C([H])([H])C([H])([H])[H] 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
- -1 silver halide Chemical class 0.000 abstract 1
- 125000003944 tolyl group Chemical group 0.000 abstract 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
532,895. Photographic de - sensitizers. KODAK, Ltd., and KNOTT, E. B. Aug. 15, 1939, No. 23472. [Class 98 (ii)] A gelatino silver halide emulsion is desensitized after exposure by treatment in a bath containing a 3:6-diamino-1:2:4:5-tetrazine in which the atoms or groups attached to the amino nitrogen atoms are hydrogen, alkyl such as methyl or ethyl, aryl such as phenyl or tolyl, aralkyl such as phenylethyl or acyl such as acetyl, propionyl, or benzoyl, preferably the unsubstituted compound. A. separate solution may be employed containing the free base, or a salt of the free base from which the base is liberated by alkali, such as the alkali of the developing solution, or the de-sensitizer may be incorporated in the developing solution itself, for example at least 0.0002 grams per litre. The unsubstituted compound is itself a developing agent.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB23472/39A GB532895A (en) | 1939-08-15 | 1939-08-15 | Improvements in desensitisation of photographic emulsions |
| US335339A US2263002A (en) | 1939-08-15 | 1940-05-15 | Desensitization of photographic emulsions |
| FR866741D FR866741A (en) | 1939-08-15 | 1940-08-14 | Improvements to the desensitization of photographic emulsions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB23472/39A GB532895A (en) | 1939-08-15 | 1939-08-15 | Improvements in desensitisation of photographic emulsions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB532895A true GB532895A (en) | 1941-02-03 |
Family
ID=10196169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23472/39A Expired GB532895A (en) | 1939-08-15 | 1939-08-15 | Improvements in desensitisation of photographic emulsions |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2263002A (en) |
| FR (1) | FR866741A (en) |
| GB (1) | GB532895A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2857273A (en) * | 1953-07-31 | 1958-10-21 | Gen Aniline & Film Corp | Photographic film having enhanced herschel effect susceptibility and the process using the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2461679A (en) * | 1944-09-04 | 1949-02-15 | Wingfoot Corp | Method of reacting a piperylene with a halo substituted maleic anhydride |
| GB1052876A (en) * | 1962-12-03 | |||
| US4011081A (en) * | 1973-09-19 | 1977-03-08 | Eastman Kodak Company | Direct-positive double exposure process utilizing a primitive, unfogged silver halide emulsion containing an electron acceptor |
-
1939
- 1939-08-15 GB GB23472/39A patent/GB532895A/en not_active Expired
-
1940
- 1940-05-15 US US335339A patent/US2263002A/en not_active Expired - Lifetime
- 1940-08-14 FR FR866741D patent/FR866741A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2857273A (en) * | 1953-07-31 | 1958-10-21 | Gen Aniline & Film Corp | Photographic film having enhanced herschel effect susceptibility and the process using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| FR866741A (en) | 1941-08-30 |
| US2263002A (en) | 1941-11-18 |
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