US2281273A - Photographic subtractive multicolor picture - Google Patents

Photographic subtractive multicolor picture Download PDF

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Publication number
US2281273A
US2281273A US250162A US25016239A US2281273A US 2281273 A US2281273 A US 2281273A US 250162 A US250162 A US 250162A US 25016239 A US25016239 A US 25016239A US 2281273 A US2281273 A US 2281273A
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US
United States
Prior art keywords
blue
layer
image
bath
color
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 - Lifetime
Application number
US250162A
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English (en)
Inventor
Eggert John
Schultze Werner
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.)
GAF Chemicals Corp
Original Assignee
General Aniline and Film 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 General Aniline and Film Corp filed Critical General Aniline and Film Corp
Application granted granted Critical
Publication of US2281273A publication Critical patent/US2281273A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials
    • 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
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
    • G03C8/02—Photosensitive materials characterised by the image-forming section
    • G03C8/04—Photosensitive materials characterised by the image-forming section the substances transferred by diffusion consisting of inorganic or organo-metallic compounds derived from photosensitive noble metals

Definitions

  • a material which on one side comprises two layers having purple and yellow dyestuffs which are bleached proportionally.
  • This arrangement of layers has especial advantage when a lenticular screen bipack is used as exposure material for a three-color exposure.
  • the front film in this case is a lenticular screen film and comprises the blue and green sensations, whereas the back fllm becomes the red sensation.
  • the front film in order to obtain a better resolving power, is developed to a positive by the reversal process.
  • the back film on the other hand is preferably developed to a negative, for in the reversal development it is more difficult to avoid variations of density and these, particularly if they occur in the blue-green component image, produce unpleasant variations of color in the copy.
  • the above mentioned multi-layer copying material is particularly well suited for such an exposure material, for it is necessary to have positives for the silver bleaching out dyestufi' layers and a negative for the layer which is to be toned with Prussian blue as the master images.
  • Yet another object of the invention is the provision of a treatment with a bichromate-sulfuric acid bath.
  • a bichromate-sulfuric acid bath By means of this bath the original color densityof the ferrocyanideblue image is restored.
  • the gradually increasing darkening of the blue image referred to above does not occur and copies capable of reproduction are obtained.
  • the invention involvesa considerable simplification of the whole working in that simultaneously with this use of the bichromate-sulfuric acid bath the silver remaining from the silver bleaching out dyestuffotherwise would be effected by a milder oxidizing agent, for instance with a Farmer's reducer or copper chloride followed by fixing.
  • a milder oxidizing agent for instance with a Farmer's reducer or copper chloride followed by fixing.
  • bichromate-sulfurlc acid for'removal of the silver, since the most commonlyused blue-green dyestuifs are wholly or partially destroyed.
  • ithas been found most unexpectedly that the usual purple and yellow dyestuffs are stable to the bichromate-sulfuric acid bath.
  • the film is then developed and fixed, toned in blue on the side carrying the red sensation byfloating in one of the known blue toning baths, fixed and subsequently bleached by a usual silver bleaching out dye bath.
  • the film is then run through a bath having the following composition:

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US250162A 1938-01-11 1939-01-10 Photographic subtractive multicolor picture Expired - Lifetime US2281273A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI0060210 1938-01-11

Publications (1)

Publication Number Publication Date
US2281273A true US2281273A (en) 1942-04-28

Family

ID=7195189

Family Applications (1)

Application Number Title Priority Date Filing Date
US250162A Expired - Lifetime US2281273A (en) 1938-01-11 1939-01-10 Photographic subtractive multicolor picture

Country Status (4)

Country Link
US (1) US2281273A (enrdf_load_stackoverflow)
BE (1) BE432075A (enrdf_load_stackoverflow)
FR (1) FR848675A (enrdf_load_stackoverflow)
GB (1) GB510523A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB510523A (en) 1939-07-31
FR848675A (fr) 1939-11-03
BE432075A (enrdf_load_stackoverflow)

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