GB773388A - Method of obtaining a direct-positive image in a silver halide emulsion layer - Google Patents

Method of obtaining a direct-positive image in a silver halide emulsion layer

Info

Publication number
GB773388A
GB773388A GB17105/55A GB1710555A GB773388A GB 773388 A GB773388 A GB 773388A GB 17105/55 A GB17105/55 A GB 17105/55A GB 1710555 A GB1710555 A GB 1710555A GB 773388 A GB773388 A GB 773388A
Authority
GB
United Kingdom
Prior art keywords
emulsion
clayden
silver halide
density
light
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
GB17105/55A
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 GB773388A publication Critical patent/GB773388A/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
    • 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
    • G03C1/36—Desensitisers
    • 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
    • G03C1/10—Organic substances
    • G03C1/12—Methine and polymethine dyes
    • G03C1/22—Methine and polymethine dyes with an even number of CH groups
    • 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
    • G03C1/48592—Positive image obtained by various effects other than photohole bleaching or internal image desensitisation, e.g. Sabatier, Clayden effect
    • 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
    • Y10S430/141—Direct positive material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Plural Heterocyclic Compounds (AREA)

Abstract

773,388. Photographic processes. KODAK, Ltd. June 14, 1955 [June 29, 1954], No. 17105/55. Class 98(2) A reversed photographic image is obtained by imagewise exposing to a flash of sufficiently high intensity and sufficiently short duration to produce imagewise Clayden desensitization, a silver halide emulsion which is "Clayden desensitizable to some degree" as defined below, said emulsion containing at least 100 mg/mole of silver halide of a merocyanine dye of the formula:- or a hemioxonol dye of the formula:- wherein R represents hydrogen or an alkyl group, R<SP>1</SP> represents an alkyl group X completes a thiazole, thiazoline, benzothiazole, naphthathiazole, benzoxazole. naphthoxazole or quinoline nucleus and Y completes a rhodanine, thiohydantoin or 2- thio-2:4-oxazoledione nucleus, then uniformly exposing the emulsion to low intensity light for a sufficiently long time to render developable the regions of the emulsion layer which have not been Clayden desensitized, and developing the emulsion. An emulsion for use in the invention which is "Clayden desensitizable to some degree" is one which, when exposed under a step tablet having 28 steps starting with approximately zero density and increasing in intervals of 0.3 density to light from a high intensity flash lamp having 18,000 lumen secs. output in 0.0005 sec., two feet from the emulsion, and then exposed again with the step tablet rotated 90 degrees to light from a 1000 watt tungsten lamp two feet from the emulsion, for two minutes, shows at least 0.10 log E or 1/3 step decrease in density between an area receiving only low intensity exposure and an area receiving the same level of low intensity exposure plus some level of high intensity exposure when developed for 2“ mins. at 68‹F. in an aqueous developing solution containing specified amounts of hydroquinone, sodium sulphite, paraformaldehyde, potassium metabisulphite, boric acid and potassium bromide. Specification 699,659 is referred to.
GB17105/55A 1954-06-29 1955-06-14 Method of obtaining a direct-positive image in a silver halide emulsion layer Expired GB773388A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US440283A US2828203A (en) 1954-06-29 1954-06-29 Method of increasing clayden desensitization of photographic emulsions

Publications (1)

Publication Number Publication Date
GB773388A true GB773388A (en) 1957-04-24

Family

ID=23748162

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17105/55A Expired GB773388A (en) 1954-06-29 1955-06-14 Method of obtaining a direct-positive image in a silver halide emulsion layer

Country Status (5)

Country Link
US (1) US2828203A (en)
BE (1) BE539345A (en)
DE (1) DE1022090B (en)
FR (1) FR1126802A (en)
GB (1) GB773388A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3063350A (en) * 1958-08-11 1962-11-13 Honeywell Regulator Co Recorder
GB1335965A (en) * 1970-02-17 1973-10-31 Agfa Gevaert Spectrally sensitized silver halide emulsions

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2078233A (en) * 1934-09-14 1937-04-27 Eastman Kodak Co Photographic emulsion
US2263757A (en) * 1937-12-16 1941-11-25 Eastman Kodak Co Ketone dye and process for preparing it
US2282116A (en) * 1939-04-14 1942-05-05 Eastman Kodak Co Photographic element

Also Published As

Publication number Publication date
BE539345A (en)
US2828203A (en) 1958-03-25
DE1022090B (en) 1958-01-02
FR1126802A (en) 1956-12-03

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