GB778792A - Improvements in photographic reproduction processes and in developers and sensitive emulsions therefor - Google Patents

Improvements in photographic reproduction processes and in developers and sensitive emulsions therefor

Info

Publication number
GB778792A
GB778792A GB19785/55A GB1978555A GB778792A GB 778792 A GB778792 A GB 778792A GB 19785/55 A GB19785/55 A GB 19785/55A GB 1978555 A GB1978555 A GB 1978555A GB 778792 A GB778792 A GB 778792A
Authority
GB
United Kingdom
Prior art keywords
silver
silver halide
hypo
developer
emulsion
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
Application number
GB19785/55A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kodak Ltd
Original Assignee
Kodak Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kodak Ltd filed Critical Kodak Ltd
Publication of GB778792A publication Critical patent/GB778792A/en
Expired legal-status Critical Current

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
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
    • G03C8/02—Photosensitive materials characterised by the image-forming section
    • G03C8/04—Photosensitive materials characterised by the image-forming section the substances transferred by diffusion consisting of inorganic or organo-metallic compounds derived from photosensitive noble metals
    • G03C8/06—Silver salt diffusion transfer

Abstract

778,792. Photographic reversal transfer; silver halide emulsions and developers. KODAK, Ltd. July 8, 1955 [July 15, 1954], No. 19785/55. Drawings to Specification. Class 98(2) In transfer from unexposed areas of an emulsion layer to a receiving layer to form a positive silver or silver compound image therein during development in presence of a silver halide solvent, a 3-pyrazolidone and an ascorbic acid developing agent are used together, and may have been originally present in either the emulsion layer or the developer. Separately these agents have too low developing energy for the process. Developers containing the two agents particularly with hypo as silver halide solvent may be used to develop silver halide emulsion layers in the ordinary way, and subsequent washing of the latter is unnecessary. Potassium iodide may replace the hypo for this. Fifteen examples illustrate the transfer process, some of these being concerned for comparison purposes with one only of the above pair of developing agents and with hydroquinone as developer. In Example 1 an exposed bromoiodide negative emulsion. layer, and a baryta coated paper treated with a mixture formed from silica, sodium sulphide, cadmium acetate, lead acetate and water as receiving layer, are immersed for six seconds in a developer containing sodium sulphite, d-iso-ascorbic acid, hypo, sodium hydroxide, potassium bromide, 1- phenyl-3-pyrazolidone and benzotriazole, pressed together and separated after one minute to show the positive image in the receiving layer, such image consisting of both silver sulphide formed by precipitation and silver formed by nuclei effect. In Example 4 a gelatino-silver chloride emulsion containing the pair of developing agents is treated for transfer similarly except that immersion is effected into a solution containing hypo, sodium hydroxide and sodium sulphite only. In Example 9 the developer of the invention contains high viscosity sodium carboxymethyl cellulose for " sandwich spreading between rollers. Numerous other 3-pyrazolidones, silver precipitants, nuclei forming materials, and silver halide solvents are quoted. Specifications 757,271 and 767,705 [Group IV(b)] are referred to. Reference has been directed by the Comptroller to Specification 542,502.
GB19785/55A 1954-07-15 1955-07-08 Improvements in photographic reproduction processes and in developers and sensitive emulsions therefor Expired GB778792A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US443536A US2751300A (en) 1954-07-15 1954-07-15 Photographic solvent transfer reproduction process

Publications (1)

Publication Number Publication Date
GB778792A true GB778792A (en) 1957-07-10

Family

ID=23761175

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19785/55A Expired GB778792A (en) 1954-07-15 1955-07-08 Improvements in photographic reproduction processes and in developers and sensitive emulsions therefor

Country Status (4)

Country Link
US (1) US2751300A (en)
BE (1) BE539816A (en)
FR (1) FR1146552A (en)
GB (1) GB778792A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4847339A (en) * 1971-10-15 1973-07-05

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2855299A (en) * 1955-06-07 1958-10-07 Polaroid Corp Photographic processes
US2965482A (en) * 1955-09-08 1960-12-20 Haloid Zerox Inc Method for fixing xerographic images
NL110125C (en) * 1957-04-24
DE1073306B (en) * 1958-05-07 1960-01-14 General Aniline ß. Film Corporation, New York, N Y. (V St A) Image receiving material for use in the silver salt diffusion transfer photographic process and process for its manufacture
US2983606A (en) * 1958-07-14 1961-05-09 Polaroid Corp Processes and products for forming photographic images in color
BE586348A (en) * 1959-01-10
BE621608A (en) * 1959-04-10
US3234022A (en) * 1960-08-08 1966-02-08 Polaroid Corp Diffusion-transfer reversal processes and elements useful in such processes
BE609057A (en) * 1960-10-12
NL123554C (en) * 1961-03-09
US3278307A (en) * 1961-11-21 1966-10-11 Eastman Kodak Co Photographic process for producing prints stabilized against print-out
US3253923A (en) * 1962-08-31 1966-05-31 Eastman Kodak Co Process for intensifying and fixing print-out images
US3330661A (en) * 1962-11-13 1967-07-11 Eastman Kodak Co Photographic development precursors
US3464822A (en) * 1965-09-13 1969-09-02 Du Pont Process for making electrically conductive images
AU456094B2 (en) * 1971-05-15 1974-12-12 Minnesota Mining And Manufacturing Company New development composition for radiographic film
US4049450A (en) * 1976-03-30 1977-09-20 Polaroid Corporation 4-Hydroxypyrazole developing agents
EP0723203B1 (en) * 1994-12-28 1998-06-24 Agfa-Gevaert N.V. A method for making a lithographic printing plate

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE530885A (en) * 1953-08-03

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4847339A (en) * 1971-10-15 1973-07-05
JPS5310856B2 (en) * 1971-10-15 1978-04-17

Also Published As

Publication number Publication date
US2751300A (en) 1956-06-19
BE539816A (en)
FR1146552A (en) 1957-11-13

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