GB247169A - Improvements in or relating to developing photographs - Google Patents

Improvements in or relating to developing photographs

Info

Publication number
GB247169A
GB247169A GB1553/26A GB155326A GB247169A GB 247169 A GB247169 A GB 247169A GB 1553/26 A GB1553/26 A GB 1553/26A GB 155326 A GB155326 A GB 155326A GB 247169 A GB247169 A GB 247169A
Authority
GB
United Kingdom
Prior art keywords
negative
developer
reversing
strength
good positive
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
GB1553/26A
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.)
La Societe du Film en Couleurs Keller Dorian
Original Assignee
La Societe du Film en Couleurs Keller Dorian
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 La Societe du Film en Couleurs Keller Dorian filed Critical La Societe du Film en Couleurs Keller Dorian
Publication of GB247169A publication Critical patent/GB247169A/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
    • G03C5/50—Reversal development; Contact processes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Abstract

247,169. Soc. Mondiale du Film en Couleurs Keller-Dorian. Feb. 9, 1925, [Convention date]. Void [Published under Sect. 91 of the Acts]. Developing; reversing.-In the process of producing positives directly by reversing a negative made in a silver sensitive layer of normal thickness, it is usual to over-expose the layer when making the negative, in order to obtain a good positive. This is avoided according to the invention by adding to the developer a solvent for the silver halide. of such strength that a good positive is obtained when the negative has received the normal exposure. Hyposulphite is preferred, and may be used with any developer, for example glycin, of which it forms from 0.5 to 1 per cent of the strength; but sulphocyanide, cyanide, and ammonia may also be used.
GB1553/26A 1925-02-09 1926-01-19 Improvements in or relating to developing photographs Expired GB247169A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR605883T 1925-02-09

Publications (1)

Publication Number Publication Date
GB247169A true GB247169A (en) 1927-02-03

Family

ID=8974305

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1553/26A Expired GB247169A (en) 1925-02-09 1926-01-19 Improvements in or relating to developing photographs

Country Status (2)

Country Link
FR (1) FR605883A (en)
GB (1) GB247169A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2663641A (en) * 1946-10-07 1953-12-22 Gevaert Photo Prod Nv Production of reversal images

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2663641A (en) * 1946-10-07 1953-12-22 Gevaert Photo Prod Nv Production of reversal images

Also Published As

Publication number Publication date
FR605883A (en) 1926-06-03

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