CA1029592A - Two-step photographic processing of black and white images which enhances the images by controlled bleaching during fixing immediately following development and which produces black and white images with reduced density in low-density areas - Google Patents

Two-step photographic processing of black and white images which enhances the images by controlled bleaching during fixing immediately following development and which produces black and white images with reduced density in low-density areas

Info

Publication number
CA1029592A
CA1029592A CA187,594A CA187594A CA1029592A CA 1029592 A CA1029592 A CA 1029592A CA 187594 A CA187594 A CA 187594A CA 1029592 A CA1029592 A CA 1029592A
Authority
CA
Canada
Prior art keywords
images
black
white images
density
enhances
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
CA187,594A
Other languages
French (fr)
Inventor
Donald J. Sykes
Louis D. Pratt
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.)
Philip A Hunt Chemical Corp
Original Assignee
Philip A Hunt Chemical Corp
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 Philip A Hunt Chemical Corp filed Critical Philip A Hunt Chemical Corp
Priority to CA242,976A priority Critical patent/CA1030004A/en
Application granted granted Critical
Publication of CA1029592A publication Critical patent/CA1029592A/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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/38—Fixing; Developing-fixing; Hardening-fixing
    • 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
    • G03C5/40—Chemically transforming developed images
    • G03C5/42—Reducing; Intensifying

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
CA187,594A 1972-12-07 1973-12-06 Two-step photographic processing of black and white images which enhances the images by controlled bleaching during fixing immediately following development and which produces black and white images with reduced density in low-density areas Expired CA1029592A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA242,976A CA1030004A (en) 1972-12-07 1976-01-06 Two-step photographic processing of black and white images which enhances the images by controlled bleaching during fixing immediately following development and which produces black and white images with reduced density in low-density areas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US31282872A 1972-12-07 1972-12-07

Publications (1)

Publication Number Publication Date
CA1029592A true CA1029592A (en) 1978-04-18

Family

ID=23213195

Family Applications (1)

Application Number Title Priority Date Filing Date
CA187,594A Expired CA1029592A (en) 1972-12-07 1973-12-06 Two-step photographic processing of black and white images which enhances the images by controlled bleaching during fixing immediately following development and which produces black and white images with reduced density in low-density areas

Country Status (5)

Country Link
JP (1) JPS49110345A (en)
BE (1) BE808314A (en)
CA (1) CA1029592A (en)
FR (1) FR2209951B1 (en)
GB (1) GB1448006A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4733031B2 (en) 2003-07-21 2011-07-27 アクゾ ノーベル ナムローゼ フェンノートシャップ Aqueous solution of sodium salt of HEDTA

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH336257A (en) * 1953-12-05 1959-02-15 Agfa Ag Method of bleach-fixing photographic images
GB1150466A (en) * 1966-05-06 1969-04-30 Fuji Photo Film Co Ltd Improvements in Colour Photography Processes
DE1942688A1 (en) * 1968-09-13 1970-06-25 Rca Corp Developers for use in developing silver emulsion photographic plates
GB1336102A (en) * 1972-01-03 1973-11-07 Fuji Photo Film Co Ltd Processing of silver halide photographic material

Also Published As

Publication number Publication date
JPS49110345A (en) 1974-10-21
FR2209951B1 (en) 1977-08-12
GB1448006A (en) 1976-09-02
BE808314A (en) 1974-03-29
FR2209951A1 (en) 1974-07-05

Similar Documents

Publication Publication Date Title
CA976406A (en) Silver halide photographic compositions and processes for obtaining positive images
GB1368257A (en) Process of developing colour photographic images
CA1029592A (en) Two-step photographic processing of black and white images which enhances the images by controlled bleaching during fixing immediately following development and which produces black and white images with reduced density in low-density areas
CA1030004A (en) Two-step photographic processing of black and white images which enhances the images by controlled bleaching during fixing immediately following development and which produces black and white images with reduced density in low-density areas
IT982932B (en) DIRECT POSITIVE EMULSION AND PROCEDURE FOR PRODUCING PHOTOGRAPHIC IMAGES WITH IT
CA934593A (en) Method of improving the apparent granularity of a photographic image
AU2528871A (en) Rapid photographic processing solutions and method
IT960910B (en) PHOTOGRAPHIC MATERIAL WITH DIRECT POSITIVE EMUL SION AND SENSITIZING COLORS FOR IT
CA919469A (en) Photographic imaging method and apparatus
CA998551A (en) Sulfite esters as preservatives for black and white developing agents
CA937435A (en) Method of producing photographic negatives and prints
CA962873A (en) Electrophotographic light-sensitive material for producing continuous-tone images
CA738343A (en) Photographic polymeric images and process for producing same
CA773131A (en) Method and material for producing photographic color images
CA718366A (en) Process for the manufacture of photographic color images and color correction
CA858480A (en) Photographic processing liquids and method of producing photographic images
CA999468A (en) Method and materials for photographic color imaging
AU413401B2 (en) Photographic process and apparatus for producing photographic images
CA964530A (en) Development means and methods for developing electrostatic images
CA845232A (en) Method for washing and protecting photographic silver images
AU6003369A (en) Photographic process and developer
CA910317A (en) Photographic bleaching and antifogging agents
CA756353A (en) Process and apparatus for producing photographic color reproductions
CA819659A (en) Photographic process and apparatus for producing photographic images
CA740113A (en) Simultaneous xerographic image formation and development