US1673522A - Process of manufacturing photographic silver halide emulsions and products obtained thereby - Google Patents
Process of manufacturing photographic silver halide emulsions and products obtained thereby Download PDFInfo
- Publication number
- US1673522A US1673522A US121731A US12173126A US1673522A US 1673522 A US1673522 A US 1673522A US 121731 A US121731 A US 121731A US 12173126 A US12173126 A US 12173126A US 1673522 A US1673522 A US 1673522A
- Authority
- US
- United States
- Prior art keywords
- silver halide
- halide emulsions
- photographic silver
- emulsion
- products obtained
- 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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
- G03C1/08—Sensitivity-increasing substances
- G03C1/09—Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising
Definitions
- the sensitivity of photographic silver halide emulsions may be raised without fogging, according to t e present invention, by adding to the emulsion, during emulsion making, small quantities of salts soluble in water, the anions of which contain at least three atoms of sulphur.
- the addition may be made to the constituents of the emulsion, or at any step of emulsion making, or to the finished emulsion. 2a
- the compounds adapted to be added for this purpose e. g.
- the. decomposition producing silver-metalloid takes place in the emulsion.
- the invention depends on the knowledge that the sensitivity of photo- 40 graphic emulsions is raised in a particularly good manner when traces of silver-metalloid, especially of silver sulphide,constituting reducing agents,--are produced by the de- A com osition of the above-mentioned decomposa le compounds inside of the silver halide crystals or on their surfaces.
- the use of soluble sulphides or of colloidal silver sulhide solutions never results inanalogous increases in the sensitivity of the halide emulsions.
- Example 2 The same effect is reached by substituting for; the sodium trithionate in Example 1,
- Process of making a photographic silver halide emulsion which comprises ,incorporating in said emulsion a water-soluble salt the anions of which contain at least three atoms of an element of the sulphur g in; 2. rocess of manufacturing photographic silver halide emulsions which comprises addin to the emulsion Water-soluble saltsthe anions of which contain at least three atoms of an element of the sulphur group.
- Photographic layers comprising the silver halide emulsion defined in claim 6.
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1673522X | 1925-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1673522A true US1673522A (en) | 1928-06-12 |
Family
ID=7738953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US121731A Expired - Lifetime US1673522A (en) | 1925-07-25 | 1926-07-10 | Process of manufacturing photographic silver halide emulsions and products obtained thereby |
Country Status (3)
Country | Link |
---|---|
US (1) | US1673522A (xx) |
BE (1) | BE335768A (xx) |
FR (1) | FR617564A (xx) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2440206A (en) * | 1944-09-16 | 1948-04-20 | Gen Aniline & Film Corp | Stabilized silver halide emulsions |
US2448939A (en) * | 1944-06-10 | 1948-09-07 | Eastman Kodak Co | Thioglycolic amide couplers |
US2657135A (en) * | 1949-03-02 | 1953-10-27 | Eastman Kodak Co | Photographic emulsions and solutions containing thioglycolic acid derivatives |
US3033765A (en) * | 1958-06-06 | 1962-05-08 | Eastman Kodak Co | Photographic production of electrically conducting silver images |
US3717466A (en) * | 1970-04-01 | 1973-02-20 | Agfa Gevaert Nv | Fogged direct positive silver halide element containing a selenium compound sensitizer |
EP0447105A1 (en) * | 1990-03-08 | 1991-09-18 | Konica Corporation | Image forming method |
EP0772079A2 (en) | 1995-10-31 | 1997-05-07 | Eastman Kodak Company | Light-sensitive silber halide emulsions and processes for their preparation |
-
0
- BE BE335768D patent/BE335768A/xx unknown
-
1926
- 1926-06-15 FR FR617564D patent/FR617564A/fr not_active Expired
- 1926-07-10 US US121731A patent/US1673522A/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2448939A (en) * | 1944-06-10 | 1948-09-07 | Eastman Kodak Co | Thioglycolic amide couplers |
US2440206A (en) * | 1944-09-16 | 1948-04-20 | Gen Aniline & Film Corp | Stabilized silver halide emulsions |
US2657135A (en) * | 1949-03-02 | 1953-10-27 | Eastman Kodak Co | Photographic emulsions and solutions containing thioglycolic acid derivatives |
US3033765A (en) * | 1958-06-06 | 1962-05-08 | Eastman Kodak Co | Photographic production of electrically conducting silver images |
US3717466A (en) * | 1970-04-01 | 1973-02-20 | Agfa Gevaert Nv | Fogged direct positive silver halide element containing a selenium compound sensitizer |
EP0447105A1 (en) * | 1990-03-08 | 1991-09-18 | Konica Corporation | Image forming method |
EP0772079A2 (en) | 1995-10-31 | 1997-05-07 | Eastman Kodak Company | Light-sensitive silber halide emulsions and processes for their preparation |
Also Published As
Publication number | Publication date |
---|---|
FR617564A (fr) | 1927-02-22 |
BE335768A (xx) |
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