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
  • G03C5/29—Development processes or agents therefor
  • G03C5/315—Tanning development

Definitions

• the invention consists in applying to photographic emulsions (for instance halogen-silver-emulsions) soluble, non-diffusing colloidal and highly transparent dyes (substantive cotton dyes), in which the emulsions are colored, such emulsions serving then for the production of-monochrome or multi-color gelatin, relief ,photographs' in the multi-color-specially three color photography.
• photographic emulsions for instance halogen-silver-emulsions
• non-diffusing colloidal and highly transparent dyes substantially transparent dyes
• substantially cotton dyes substantially transparent dyes
• the removable emulsions containing thenon-diffusing colloidal dyes being squeezed on paper after their tanning developmentproducing relief pictures, dried and pulled ofi.
• the colloidal color photographs are quite clear, as the photograph, when being transferred onto paper do not diffuse. This is especially advantageous for the production of three color photographs, as these, when the individual photographs are made on emulsions capable to be transferred; require the prevention of diffusions of the colors at the transferring upon color emulsions which have already been properly mounted.
• the invention consists further in that the in- ,dividual relief photographs, produced by tanning developing and colored with nondiffusing' 'colloidal dyes", are mounted successively on a support such as paper, celluloid or the like so that-the contours register and then pulled off their emulsion carriers, each emulsion being pressed on the support and dried, before the next following emulsion is pressed on, so that the finished multi-color photograph consists only of superposed transfer-- special manner of applyingthe developer and in a support.
• a support such as paper, celluloid or the like
• a solution containing the tannin, pyrocatechin, and sodium sulphite in which the ratio of sodium sulphite to pyrocatechin by weight is greater than one-half.
• the use of a pyrocatechindeveloper without sodium sulphite enables to produce washable relief photographs but, because of the accompanying oxidizing reaction the gelatin, adjacent to the silver, is hardened and made insoluble.
• the use of a substantial quantity of sodium sulphite prevents oxidation and consequent hardening of the gelatin, and thus provides for its removal with hot water.
• colloidal dyes are added to the photographic emulsion, it will be found, that the tanning developer without the sulphite is incapable of dissolving the gelatin-dye-complex even, in very hot water. Only developing solutions containing higher quantities of sulphite are capable of dissolving an excess of the gelatin dye.
• a halogen silver gelatin layer to which colloidal dyes'are added, is developed with a pyrocatechin developer containing a quantity by weight of sodium sulphite,
• the coloring can be made weaker as desired, by subjecting the support bearing the gelatin-dye-complexes to a warm water bath for a sufilcient time to accomplish approximate or complete dissolution of the excess complexes.
• a f: vorable ,mutual blending of the part photographs can be obtained.
• this blending is important.
• At the copying and developing of multicolor photographs it happens frequently, that an excess of certain colors occurs.
• Excess of color can be easily eliminated, according to the invention, by weakening. Longer washing for weakening, as is for instance usual for mordant dyes photographs, absorption photographsor the like, is impossible for colloidal dyes relief photographs.
• Every individual relief photograph can be produced, according .to the invention, with the aid of a half tone screen, mutually displaced half tone screens being for instance used for the differently colored relief photographs.
• this layers can be produced on transparent supports.
• That process of color photography which consists in preparing .a set of films having transparent supports coated with a light sensitive emulsion layer on one side, dyeing each respective emulsion layer with a respective primary color with a substantive cotton dye corresponding to such color, printing each film through its support from the corresponding color selection negative, developing the printed films to form positives in a solution of pyrocatechin and sodium sulphite, fixing the developed positives, and arranging the fixed emulsion layers in superposed registering relation and stripped from their supports.
• That process of color photography which consists in preparing a set of films having transparent supports coated with a light sensitive emulsion layer on one side, dyeing each respective emulsion layer with a respective primary color with a non-diifusing-colloidal transparent substantive cotton dye corresponding to "such color, printing each film through its support from the. corresponding color selection negative, developing the printed films to form positives in a solution of pyrocatechin and sodium sulphite, fixing the developed positives, and arranging the fixed emulsion layers in superposed registering relation and stripped from their supports.
• That process of color photography which consists in preparing a set of films having translparent supports coated with a light sensitive emulsion layer on one side, dyeing each respective emulsion layer with a respective primary color with a substantive cotton dye corresponding to such color, printing each film through its support from the corresponding color selection negative, developing the printed films to form positives in a solution of pyrocatechin and sodium sulphite, fixing the developed positives, placing one of the fixed positives on a permanent support with the emulsion side in contact with the permanent support, stripping the transparent support from the placed emulsion, similarly treating the remaining fixed positives to cause them to lie in superposed relation and in registry.
• That process of color photography which consists in preparing a set of films having transparent supports coated with a light sensitive emulsion layer on one side, dyeing each respective emulsion layer with a respective primary color with a non-diffusing colloidal transparent substantive cotton dye corresponding to such color, printing eachfilm through its support from the corresponding color selection negative, de-
• That process of color photography which consists in preparing a set of films having transparent gelatinous supports coated with a light sensitive emulsion layer on one side, dyeing each respective emulsion layer with a respective primary color with a non-diffusing colloidal transparent substantive cotton dye corresponding to such color, printing each film through its support from the corresponding color selection negative, developing the printed films to form positives in a solution of pyrocatechin and sodium sulphite, fixing the developed positives, and arranging the fixed emulsion layers in superposed registering relation and stripped from their supports.
• That process of color photography which consists in preparing a set of films having transparent gelatinous supports coated with a light sensitive emulsion layer on one side, dyeing each respective emulsion layer with a respective primary color with a substantive cotton dye corresponding to such color, printing each film through its support from the corresponding color selection negative, developing the printed films to form positives in a solution of pyrocatechin and sodium sulphite, fixing the developed positives, placing one of the fixed positives on a permanent support with the emulsion side in contact with .the permanent support, stripping the transparent support from the placed emulsion, similarly treating the remaining fixed positives to cause them to lie in superposed relation and in registry.
• That process of color photography which consists in preparing a set of films having transparent gelatinous supports coated with a light sensitive emulsion layer on one side, dyeing each respective emulsion layer with a respective primary color with a non-diffusing colloidal transparent substantive cotton dye corresponding to such color, printing each'film through its support from the corresponding color selection negative, developing the printed films to form positives in a solution of pyrocatechin and sodium sulphite, fixing the developed positives, placing one of the fixed positives on a permanent support with the emulsion side in contact with the permanent support, stripping the transparent support from the placed emulsion, similarly treating the remaining fixed positives to cause them to lie in superposed relation and in registry.
• That process of color' photography which consists in preparing a set of films having transparent supports coated with a light sensitive emulsion layer on one side, dyeing each respective emulsion layer with a respective primary color with a substantive cotton dye corresponding to such color, printing each film through its support from the corresponding color selection negative, developing the printed films to form positives in a solution of pyrocatechin and sodium sulphite with the sodium sulphite exceeding by weight one-half the pyrocatechin, fixing the developed positives, and arranging the fixed emulsion layers in superposed registering relation and stripped from their supports.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Color Printing (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=26011409

Family Applications (1)

Country Status (3)

Cited By (2)

Families Citing this family (2)

• 0
  • BE BE370307D patent/BE370307A/xx unknown
• 1929
  • 1929-06-04 GB GB17113/29A patent/GB333668A/en not_active Expired
• 1930
  • 1930-05-15 US US452817A patent/US1926620A/en not_active Expired - Lifetime

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