GB690997A - Process and photographic material for the direct production of positive photographic images - Google Patents
Process and photographic material for the direct production of positive photographic imagesInfo
- Publication number
- GB690997A GB690997A GB27154/49A GB2715449A GB690997A GB 690997 A GB690997 A GB 690997A GB 27154/49 A GB27154/49 A GB 27154/49A GB 2715449 A GB2715449 A GB 2715449A GB 690997 A GB690997 A GB 690997A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silver
- bromide
- sensitive
- salt
- chloride
- 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
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
- G03C5/50—Reversal development; Contact processes
-
- 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
- G03C1/485—Direct positive emulsions
- G03C1/48538—Direct positive emulsions non-prefogged, i.e. fogged after imagewise exposure
-
- 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
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/3022—Materials with specific emulsion characteristics, e.g. thickness of the layers, silver content, shape of AgX grains
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/156—Precursor compound
- Y10S430/158—Development inhibitor releaser, DIR
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
690,997. Photographic process and material for direct positives, colour photography, photomechanical printing. FARBENFABRIKEN BAYER. Oct. 21, 1949, [July 4, 1949], No. 27154/49. Class 98 (ii). A material comprising two light-sensitive silver salts, one of higher light sensitivity than the other, is exposed to an object to affect only the higher sensitive salt, and treated with a developer containing a solvent agent of higher dissolving power for the lower than the higher sensitive salt, the developer containing no salts whose anions are the same as those of the higher light-sensitive salt or containing such salts in such a small concentration that development of the lower sensitive salt is not inhibited, whereby the light affected higher sensitive salt is developed to a negative, and the lower sensitive salt is developed at non-light-affected parts, to form a positive. Silver bromide is preferred as higher light-sensitive salt and silver chloride as lower, in this case advantage being taken of the property of silver chloride of blackening on treatment with a developer containing no bromide without exposure; the blackening being inhibited at exposed parts by soluble bromide released from the developed silver bromide. Use of other silver salts such as oxalate, stearate and ferrocyanide is suggested. The solvent agent in the developer may be sodium sulphite or thiosulphate or organic amines including colour developing substances. The higher light-sensitive silver salt does not exceed ten per cent of the lower, resulting in weak negative blackening only, and this may be removed, after fixing and washing, by gentle action of a reducer to leave a positive with good whites. Development nuclei such as colloidal silver or gold and silver sulphide may be included in the material to accelerate blackening in non-exposed parts. The silver salts of different light sensitivity may be contained in the same or in separate layers. Coloured images may be made as by use of colour formers, and multicoloured images by multilayer material having layers sensitive to different regions of the spectrum. Hardening by way of silver images may be effected. Colloids other than gelatin may be used in the emulsions. The invention comprises also the light-sensitive materials themselves but only when development nuclei are present therein. Examples 1-3 describe the process using mixed chloride and bromide emulsions in a single layer which contains also colloidal silver or gold. Developers and other details are specified. In example 4 the mixed emulsion is made by adding potassium bromide or iodide to a chloride emulsion to convert a little of the silver chloride to bromide or iodide. Example 5 uses silver ferrocyanide as the salt of lower light sensitivity and silver chloride as that of the higher. Example 6 specifies a chloride-bromide emulsion mixture, the bromide being ortho-chromatically sensitized and the sodium salt of 2- stearoylamino-5-7-disulphonic acid is present to increase solubility of the silver chloride in the developer, the resulting layers being suitable for microfilms. Example 7 indicates production of a finely-grained chloride emulsion in an acetone-water solution of partly hydrolysed acetyl cellulose, precipitation of this with water, washing to remove soluble salts, re-solution in acetone-water, addition of colloidal silver and then a high-sensitive silver bromide emulsion prepared with gelatin but diluted with acetone, casting of this mixture on to paper or film, exposure and development. Example 8, directed to production of a printing relief, indicates coating of a silver chloride emulsion containing silver sulphide as nuclei and mixed with a higher-sensitive silver bromide emulsion, on to a support, exposure, treatment with a metol developer containing sodium sulphite, and then after fixing and washing with a bichromate, bromide and copper sulphate mixture in water solution to produce the printing relief. Example 9 describes exposure and colour development of a multilayer material having, on paper, glass or film, red, green and blue sensitive mixed silver bromide and silver chloride emulsions containing colloidal silver nuclei and subtractive colour formers, the material being provided with the usual yellow filter.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH690997X | 1949-07-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB690997A true GB690997A (en) | 1953-05-06 |
Family
ID=4529235
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27154/49A Expired GB690997A (en) | 1949-07-04 | 1949-10-21 | Process and photographic material for the direct production of positive photographic images |
Country Status (4)
Country | Link |
---|---|
US (1) | US2712995A (en) |
CH (1) | CH278309A (en) |
FR (1) | FR993337A (en) |
GB (1) | GB690997A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2756148A (en) * | 1954-06-29 | 1956-07-24 | Eastman Kodak Co | Photographic emulsion having clayden effect susceptibility |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2968554A (en) * | 1954-08-09 | 1961-01-17 | Polaroid Corp | Photographic transfer processes for forming multicolor dye images and photographic products for carrying out the same |
US2861885A (en) * | 1954-11-04 | 1958-11-25 | Polaroid Corp | Photographic processes and products |
US2834676A (en) * | 1955-07-19 | 1958-05-13 | Sperry Rand Corp | Photographic diffusion transfer process for producing multiple direct positive copies |
BE549753A (en) * | 1955-07-22 | |||
US2937086A (en) * | 1955-07-26 | 1960-05-17 | Eastman Kodak Co | Multilayer reversal color material |
BE552299A (en) * | 1955-11-16 | |||
BE553727A (en) * | 1955-12-27 | |||
NL104735C (en) * | 1956-06-22 | |||
US2995444A (en) * | 1957-09-26 | 1961-08-08 | Gen Aniline & Film Corp | Stabilization of photographic emulsions sensitized with alkylene oxide polymers |
US3050391A (en) * | 1957-12-30 | 1962-08-21 | Gen Aniline & Film Corp | Photographic film with fine grain silver chloride underlayer |
BE581611A (en) * | 1958-08-27 | |||
US3044873A (en) * | 1958-12-17 | 1962-07-17 | Polaroid Corp | Photographic products and processes |
BE586348A (en) * | 1959-01-10 | |||
BE619300A (en) * | 1959-04-06 | |||
US3148062A (en) * | 1959-04-06 | 1964-09-08 | Eastman Kodak Co | Photographic elements and processes using splittable couplers |
US3072480A (en) * | 1959-04-10 | 1963-01-08 | Eastman Kodak Co | Photographic diffusion transfer process |
US3140179A (en) * | 1959-10-22 | 1964-07-07 | Eastman Kodak Co | Photographic element having increased speed and contrast |
BE606548A (en) * | 1960-07-26 | |||
BE615613A (en) * | 1961-03-27 | |||
US3536488A (en) * | 1968-06-13 | 1970-10-27 | Polaroid Corp | Multicolor screen-carrying element in additive color photographic processes |
DE2036213C2 (en) * | 1970-07-21 | 1983-01-20 | Polaroid Corp., 02139 Cambridge, Mass. | Color photographic recording material |
IT974830B (en) * | 1972-11-15 | 1974-07-10 | Minnesota Mining & Mfg | METHOD FOR THE FORMATION OF A COLOR CONTRAST PHOTOGRAPHIC IMAGE PHOTOGRAPHIC ELEMENT AND DEVELOPMENT COMPOSITION SUITABLE FOR THE REALIZATION OF THIS METHOD |
US4047956A (en) * | 1975-11-17 | 1977-09-13 | E. I. Du Pont De Nemours And Company | Low coating weight silver halide element and process |
JPS6014334B2 (en) * | 1979-04-13 | 1985-04-12 | コニカ株式会社 | Shadow image forming method |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1454209A (en) * | 1922-01-13 | 1923-05-08 | Eastman Kodak Co | Self-toning photographic emulsion |
US2005837A (en) * | 1931-07-07 | 1935-06-25 | Agfa Ansco Corp | Manufacture of photographic emulsions |
US1897866A (en) * | 1931-08-25 | 1933-02-14 | Eastman Kodak Co | Color photographic process |
BE402030A (en) * | 1933-03-22 | |||
GB446172A (en) * | 1934-10-11 | 1936-04-14 | Geoffrey Bond Harrison | Improvements in or relating to photographic reversal processes |
BE425269A (en) * | 1936-12-18 | |||
US2191502A (en) * | 1937-01-22 | 1940-02-27 | Pont Film Mfg Company Du | Multicolor film and process |
GB494088A (en) * | 1937-03-18 | 1938-10-18 | Frank Forster Renwick | Improvements in or relating to photographic printing processes and materials |
BE441852A (en) * | 1939-11-02 | |||
US2358169A (en) * | 1941-03-14 | 1944-09-12 | Eastman Kodak Co | Photographic printing material |
US2352014A (en) * | 1941-07-21 | 1944-06-20 | Rott Andre | Photomechanical printing process and printing material for carrying out the same |
US2456953A (en) * | 1942-02-09 | 1948-12-21 | Eastman Kodak Co | Photographic reversal processes |
GB580173A (en) * | 1943-03-15 | 1946-08-29 | Kodak Ltd | Improvements in or relating to photographic processes |
US2456954A (en) * | 1947-08-01 | 1948-12-21 | Eastman Kodak Co | Photographic reversal processes |
US2497875A (en) * | 1947-10-17 | 1950-02-21 | Eastman Kodak Co | Direct positive photographs using aerial fogging developer |
US2496940A (en) * | 1948-10-21 | 1950-02-07 | Eastman Kodak Co | Mixed grain photographic process |
-
1949
- 1949-07-04 CH CH278309D patent/CH278309A/en unknown
- 1949-08-06 US US109073A patent/US2712995A/en not_active Expired - Lifetime
- 1949-08-16 FR FR993337D patent/FR993337A/en not_active Expired
- 1949-10-21 GB GB27154/49A patent/GB690997A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2756148A (en) * | 1954-06-29 | 1956-07-24 | Eastman Kodak Co | Photographic emulsion having clayden effect susceptibility |
Also Published As
Publication number | Publication date |
---|---|
FR993337A (en) | 1951-10-30 |
CH278309A (en) | 1951-10-15 |
US2712995A (en) | 1955-07-12 |
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