GB882690A - The production of photographic images making use of the intensity-reversal effect - Google Patents

The production of photographic images making use of the intensity-reversal effect

Info

Publication number
GB882690A
GB882690A GB8418/59A GB841859A GB882690A GB 882690 A GB882690 A GB 882690A GB 8418/59 A GB8418/59 A GB 8418/59A GB 841859 A GB841859 A GB 841859A GB 882690 A GB882690 A GB 882690A
Authority
GB
United Kingdom
Prior art keywords
exposure
emulsion
flash
flash exposure
intensity
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
GB8418/59A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB882690A publication Critical patent/GB882690A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F5/00—Screening processes; Screens therefor
    • G03F5/24—Screening processes; Screens therefor by multiple exposure, e.g. combined processes for line photo and screen
    • 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)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

882,690. Photographic materials and processes. EGGERT, J. March 11, 1959 [March 11, 1958(3)], No. 8418/59. Class 98(2). A photographic silver halide emulsion containing silver iodide and which has been subjected to physical ripening in the presence of an inhibitor but which has not received chemical ripening, is given a flash exposure of maximum duration 10<SP>-2</SP> secs., and then an imagewise exposure of lower intensity than the flash exposure. By making the flash exposure uniform, a reversal effect is obtained. The flash exposure may be a single exposure or a number of flash exposures of lower intensity. It may be given before the emulsion is cast on its support. Alternatively, the flash exposure may be given through a screen. Compensated prints may be made according to the invention from negatives having a large density range by making the flash exposure a sharp imagewise exposure and then giving an outof-focus exposure of lower intensity, for example by covering the printing paper with a sheet of opal glass. In this embodiment, the procedure may be modified by giving the outof-focus, low intensity exposure first, and then the sharp flash exposure. The emulsion is prepared by precipitating the silver halides at 40- 90‹C. in a protective colloid such as gelatin, preferably in the presence of excess watersoluble bromide, and then physically ripening the emulsion in the presence of an inhibitor or stabilizer such as a 1;3;4-triazaindolizine, a benzotriazole, hystidine, 2-ethyl benzoxazole, N-ethyl pyrrole or 2;3-dimethyl quinoxaline. The emulsion is then washed, but not subjected to chemical ripening. The emulsion or developer may contain thallium salts such as the nitrate. Specifications 619,557 628,994, 636,144 and 636,145 are referred to.
GB8418/59A 1958-03-11 1959-03-11 The production of photographic images making use of the intensity-reversal effect Expired GB882690A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH5698458A CH367706A (en) 1958-03-11 1958-03-11 Process for the photographic production of direct duplicates

Publications (1)

Publication Number Publication Date
GB882690A true GB882690A (en) 1961-11-15

Family

ID=4520844

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8418/59A Expired GB882690A (en) 1958-03-11 1959-03-11 The production of photographic images making use of the intensity-reversal effect

Country Status (6)

Country Link
US (1) US3156564A (en)
BE (1) BE576568A (en)
CH (1) CH367706A (en)
DE (1) DE1172953B (en)
FR (1) FR1221305A (en)
GB (1) GB882690A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3519426A (en) * 1966-12-27 1970-07-07 Eastman Kodak Co Preparation of silver halide emulsions having high covering power
BE758242A (en) * 1969-11-06 1971-04-30 Agfa Gevaert Nv PHOTOGRAPHIC FINE GRAINY SILVER HALOGENIDE EMULSIONS
GB1565502A (en) * 1975-09-10 1980-04-23 Minnesota Mining & Mfg Photographic materials
US4232116A (en) * 1979-01-31 1980-11-04 Minnesota Mining And Manufacturing Company Light-handleable photographic materials
JPS60122935A (en) * 1983-12-07 1985-07-01 Konishiroku Photo Ind Co Ltd Preparation of silver halide emulsion
JPS60222842A (en) * 1984-04-19 1985-11-07 Fuji Photo Film Co Ltd Silver halide photographic emulsion and its preparation

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2401051A (en) * 1939-09-26 1946-05-28 Photo Positive Corp Photographic emulsions and methods
US2444867A (en) * 1945-07-26 1948-07-06 Eastman Kodak Co Photographic masking using the clayden effect
US2444606A (en) * 1945-12-15 1948-07-06 Gen Aniline & Film Corp Stabilizers for photographic emulsions
GB699659A (en) * 1952-06-04 1953-11-11 Kodak Ltd Photographic material for making half-tone records
US2708626A (en) * 1952-06-04 1955-05-17 Eastman Kodak Co Photographic processes using prescreened material
US2912326A (en) * 1954-04-09 1959-11-10 Eastman Kodak Co Direct positive prescreened photographic material
US2912328A (en) * 1954-04-09 1959-11-10 Eastman Kodak Co Direct positive prescreened photographic material
BE543288A (en) * 1954-12-10
US3000739A (en) * 1957-04-02 1961-09-19 Du Pont Process for preparing silver halide emulsions

Also Published As

Publication number Publication date
US3156564A (en) 1964-11-10
DE1172953B (en) 1964-06-25
BE576568A (en)
CH367706A (en) 1963-02-28
FR1221305A (en) 1960-06-01

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