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
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/18—Processes for the correction of the colour image in subtractive colour photography

Definitions

• masks can be produced within the original film according to a, very simple process. This is performed in such amanner that a photographic material containing light-sensitive silver salts, color couplers, and nuclei for development is exposed to light reflected from acolored object and is color developed in a special developer. During the development process the exposed silver salts are. developed to give a color image, whereas the residual unexposed silver salts are dissolved and developed in contact with said nuclei for development to give a coloredmask for said color image.
• the usual developing substances such as metol and hydroquinone
• the usual developing substances also contains silver halide solvents
• the non-exposed residual silver halide dissolves duringv the development of the exposed silver halide and diflfuses into the adjacent layercontaining the nuclei for development where it is reducedto silver by the catalytic action of said nuclei to a positiveimage of the. original.
• Proc essing can be carried out, for instance, in such a manner that one or more color components are added to the yellow filter layer which is produced in a. multi-layer photographic material according to the.
• silver halide solvents for instance, sodium thiosulfate, potassium thiocyanate, sodium sulfite, etc. may be employed.
• the following arrangement of layers may be used.
• a gelatin layer containing only nuclei for development and one coupling component necessary for masking the blue green dyestuif image.
• the red-sensitive layer with a color coupler for the blue-green dyestufi image is applied.
• a green-sensitive layer with a color coupler for the purple dyestulf image is applied, which contains the nuclei for development and one or more color components for masking the purple and perhaps also the yellow layer.
• the yellow filter layer is the upper layer, viz. the blue-sensitive layer with the color coupler for theyellow dyestufi image.
• Example 1 A negative emulsion sensitized for the red portion of the spectrum and containing per kilogram 20 grams of the following color coupler for a cyan dyestufi which is fast to diffusion is applied to any support desired:
• Example 2 The arrangement of layers of the material is the same as in Example 1, the gelatin layer, however, besides colloidal silver, contains an addition of 6 grams of a color component which is fast to diffusion for chromogenic development of the following constitution:
• Example 3 A multi-layer material is used the emulsion layers of which have the same arrangement and the same composition as in Example 1.
• the gelatin layer betwee'rl the red and green sensitized emulsion layers, however, is dispensed with, and, instead of it, to the filter layer of colloidal silver between the green sensitized and the nonsensitized emulsion layer there are added 6 grams of a color coupler of the following constitution:
• Example 4 The emulsion layers of the multi-layer material have the same arrangement and composition as in Example 1. Between the support and the emulsion layer sensitized to the red portion of the spectrum a gelatin layer is applied, which contains the same color components which are fast to diffusion for the chromogenic development as the red sensitized layer. Furthermore, between the green and red sensitized emulsion layers is applied a gelatin layer with an addition of the same color component for a yellow color image as is contained in the non-sensitized layer. After exposing, developing, bleaching and fixing, a cyan and a yellow masking image respectively is obtained in the gelatin layers.
• a material is referred to containing color couplers for the chromogenic development, which are fast to dilfusion. It is known that silver chloride emulsions are blackened also without exposure by photographic developers which are free of potassium bromide and have a certain dissolving power for silver chloride. This reaction is accelerated by the addition of nuclei for development, such as colloidal silver, colloidal gold, silver sulfide, etc.
• This process is not limited to silver chloride and silver bromide emulsions but can quite generally be carried out with mixtures of silver salt emulsions of different sensitivity and with developers exhibiting a higher dissolving power as to the less sensitive portion of the silver salt emulsions and containing no salts whose anions are the same as those of the more sensitive silver salts.
• the proportion of the more sensitive components of the silver salt emulsions in the above layers amounts to at least 5% of the whole mixture. After bleaching and fixing the above material, a negative color image and masking image of the same color is left in the layer.
• the layers formed according to the above process may find application in multi-layer materials either for one or for several layers containing color components.
• the sensitizer is added only to the more sensitive portion of the silver salt emulsions, while the color components are added in quantities of about 10 to 25 grams/ kilogram of the emulsion mixture.
• the emulsion layers of such materials can be separated from each other by thin intermediate layers of gelatin.
• the second method is based on a special emulsion layer for the production of masks.
• This masking layer also consists of a mixture of differently sensitive silver halide emulsions with an addition of nuclei for development,
• a negative color image of the object is obtained in the image layer
• a positive color masking image is obtained in the masking layer. If in the masking ilayer and in the image layer adjoine'd thereto the same couplers are used, the weak negative color image obtained in the masking image is not troublesome but may even often be of advantage, if a certain partial color image in a mu'lt'i-layer material is to 'be intensified. Sometimes, however, :it may be :desired to prevent the formation of this negative color image in the masking layer.
• This object can be achieved by adding small amounts of non-chromogenic developing substances of higher reducing power than that of the chromogenic developer, for instance, metal, to the chromogenio developer.
• the chromogenic developer for instance, metal
• reduction of the higher sensitive portion of the emulsion mixture in masking layer is effected by this substance without any color formation, as these developers :give no developmentproduets capable of coupling.
• the much larger amounts of silver chloride are reduced mainly by the color developer whose oxidation products together with the color couplers give the desired dyestuffs.
• one or more of these masking layers maybe applied at any place desired, for-example, as coating between the support and the lowest partial color layer, as intermediate coating between the partial color layers or as coating upon the upper partial color layer.
• These masking layers may contain the same color couplers as the image layers adjoined thereto; however, they may also be dififerent from those of the image layers, and also mixtures of different couplers may be used in the same masking layer.
• the masking layers can be separated from the image layers by thin gelatin layers.
• Example 5 A negative emulsion sensitized for the red portion of the spectrum and containing per kilogram of emulsion 20 grams of a color coupler for a cyan dyestutf, which is fast to dilfusion and corresponds to the following constitution:
• the partial color images are left in the emulsion layers, and a mask of yellow-orange color is left in the masking layer.
• a light sensitive material for producing masked color photographic images which comprises (a) at least one light sensitive silver halide emulsion layer containing a color coupler which couples with the oxidation product of a primary aromatic amino developing agent upon photographic devolpment to give a colored image and (b) a masking layer containing a spontaneously developable silver salt emulsion which is developable in a special photographic developing solution without exposure to actinic light and from about 1% to about 10% of the whole mixture of a light sensitive silver salt emulsion which is developable in said special developing solution only after exposure to actinic light, said spontaneously developable silver salt emulsion being of such lower light sensitivity than said light sensitive silver salt emulsion that upon exposure to the object to be reproduced only said light sensitive silver salt is aifected, said special developer being a solution of a primary aromatic amino developing agent containing a solvent agent for said spontaneously developable silver salt and containing salts having the same anions as those of said light sensitive silver salt at most in such a quantity that the
• a light sensitive material as claimed in claim I wherein the two silver halide emulsion layers are separated from each other by a thin intermediate layer.
• a process for the production of a colored image combined with a colored masking image in a light sensitive material including (a) at least one light sensitive silver halide emulsion layer containing a color coupler which couples with the oxidation product ofaprimary aromatic amino developing agent upon photographic development to give a colored image and (b) a masking layer containing a spontaneously developable silver salt emulsion which is developable in a special photographic developing solution without exposure to actinic light and from about 1% to about 10% of the whole mixture of a light sensitive silver salt emulsion which is developable in said special developing solution only after exposure to actinic light, said spontaneously developable silver salt emulsion being of such lower light sensitivity than said light sensitive silver salt emulsion that upon exposure to the object to be reproduced only said light sensitive silver salt is affected, said special developer being a solution of a primary aromatic amino developing agent containing a solvent agent for said spontaneously developable silver salt and containing salts having the same anions as those of said light sensitive silver salt at most in such
• the spontaneously developable silver salt emuls ion of the mashing layer contains silver chloride and the light sensitive silver salt emulsion of the masking layer contains silver bromide.

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• 0
  • BE BE491747D patent/BE491747A/xx unknown
• 1948
  • 1948-10-22 CH CH271389D patent/CH271389A/de unknown
• 1949
  • 1949-10-19 US US122364A patent/US2694008A/en not_active Expired - Lifetime
  • 1949-10-21 GB GB27152/49A patent/GB690996A/en not_active Expired
  • 1949-10-21 FR FR997767D patent/FR997767A/fr not_active Expired

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