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
US7211682B2 (en) 2003-07-21 2007-05-01 Akzo Nobel N.V. Aqueous solution of a 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
BE808314A (en) 1974-03-29
FR2209951A1 (en) 1974-07-05
JPS49110345A (en) 1974-10-21
GB1448006A (en) 1976-09-02
FR2209951B1 (en) 1977-08-12

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