US2219306A - Photographic material - Google Patents

Photographic material Download PDF

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Publication number
US2219306A
US2219306A US243890A US24389038A US2219306A US 2219306 A US2219306 A US 2219306A US 243890 A US243890 A US 243890A US 24389038 A US24389038 A US 24389038A US 2219306 A US2219306 A US 2219306A
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US
United States
Prior art keywords
light
layer
sensitive
dye
fast
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
US243890A
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English (en)
Inventor
Gaspar Bela
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Individual
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Individual
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Filing date
Publication date
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Publication of US2219306A publication Critical patent/US2219306A/en
Anticipated expiration legal-status Critical
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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
    • G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials

Definitions

  • an ordinary silver bromide emulsion is sensitive to blue light and remains so even if a predominant sensitivity to green, red or infrared is imparted to the emulsion 30 by the addition of a special color sensltizer.
  • a special color sensltizer for this reason in a multilayer material composed of two or more silver halide layers at least one specially sensitized layer is sensitive not only to the light for which the layer is predominantly sensi- 25 tized, but also to blue light.
  • two emulsions are sensitive to green light, if the one contains a sensitizer for green and if the other one contains a panchromatic sensitizer or one which imparts a predominant sensitivity to ad red but in addition a noticeable sensitivity to green.
  • the superimposed layer is, according to the present invention, dyed by a mixture of two different dyestuils of a color complementary to the sensitivity of this layer.
  • the auxiliary dyestui may also be applied to the rear surface of the superposed layer or may be 10 incorporated into an intermediate layer between the two layers in question.
  • the layer rst hit by the light is dyed by a dyestufl resistant to the ordinary photographic treating solutions and of a color complementary 1 to the color of the light to which this layer is sensitized, the dyestuff concentration in the layer corresponding to the color intensity required at the most intensely colored points of the image.
  • the properties of the layer allow the incident light to enter the colored layer and to penetrate it where the intensity has its maximum value.
  • the penetrating light is absorbed at the rear surface or in the intermediate layer by the auxiliary dyestui and thus the light-sensitive layer behind is effectively screened.
  • Example-Referring to the drawing on a paper support there are coated in superposition a blue-green emulsion sensitized to red light, a magenta dyed emulsion sensitized to green and a yellow dyed blue-sensitive emulsion.
  • the yellow dyed emulsion is the top layer and contains the dyestuif Xylenewalkgelb G (Shultz Farbstofftabellen, volume 2) in the form of its 35 calcium salt in a concentration of 0.45 g. per sq. m.
  • the same layer or a separate layer of plain gelatine arranged behind the same contains 1 to 2 g. per sq. m. of the dyestuff 4,4'- methenyl-bis-l (p-sulphophenyl)-3-methyl-py- 40 razolone-5 in the form of its triphenylguanidine salt.
  • the material may be exposed behind colored or black and white positive part images or behind a multi-color master-positive of the additive or subtractive type.
  • the auxiliary dyestuffs are decolorised after exposure of the three layer material preferably by a developer of alkaline reaction and the image-forming dyestuffs are locally destroyed after development oi' the silver images, for example, by an acid thiocarbamide solution or by a solution containing 5% hydrobromic acid. If necessary the silver is afterwards removed from the dyestuff image thus obtained.
  • a multilayer light-sensitivematerial comprising a support carrying a plurality of superposed silver halide emulsion layers sensitive to light of diierent colors, at least one of the layers being dyed by a dye which is fast to ordinaryphotographic treating solutions but capable -of being locally bleached in the presence of a metallic silver image and which absorbs the total spectral range of light rays for which the layer is predominantly sensitized, a second one of said plurality of superposed light-sensitive layers arranged behind said fast dyed layer being transmittant for and sensitive to such light, and a filter dye of substantially the same color as said fast dye being present in a layer in front of the said second layer but not in front of said fast dyed layer, said lter dye being removable by an agent which does not remove said fast dye.
  • a multilayer light-sensitive material comprising a support carrying' a plurality of superposed silver halide emulsion layers sensitive to light of different colors, at least one of the layers being dyed by a dye .which is fast to ordinary photographic treating solutions but capable of being locally bleached in the presence of a metallic silver image and which absorbs the total spectral range of light rays for which the layer is predominantly sensitized, a second one of said plurality of superposed light-sensitive layers arranged behind said fast dyed layer being transmittant for and sensitive to such light, and a lter dye of substantially the same color as said fast dye being present in a colloid'layer arranged between said fast dyed layer and said second light-sensitive layer, said lter dye being removable by an agent which does not remove saidV fast dye.
  • a multilayer light-sensitive material comprising a support carrying a plurality of superposed silver halide emulsion layers sensitive to light of different colors, at least one of the layers being dyed by a dye which is fast to ordinary photographic treating solutions but capable of being'locally bleached in the presence of a metallic silver image and which absorbs the total spectral range of light rays for which the layer is predominantly sensitized, a second one of said plurality of superposed light-sensitive layers arranged behind said fast dyed layer being transmittant for and sensitive to such light, and a filter dye of substantially the same color as said fast dye being present in the said fast dyed lightsensitive emulsion layer, said lter dye being removable by an agent which does not remove said fast dye.
  • a multilayer light-sensitive material comprising a support carrying a plurality of superposed silver halide emulsion layers sensitive to light of different colors, at lea'st one of the layers being dyed by a dye which is fast to ordinary photographic treating solutions but capable of being locally bleached in the presence of a metallic silver image and which absorbs the total spectral range of light rays for which the layer is predominantly sensitized, a second one of said plurality of superposed light-sensitive layers arranged behind said fast dyed layer being transmittant for and sensitive to such light, and a fil-ter dye of substantially the same color as said fast dye and which is capable of being destroyed by a photographic developer which does not remove the said fast dye, said lter dye being present in a layer in front of the said second layer but not in front of the said fast dyed layer.
  • a multilayer light-sensitive material comprising a support carrying a plurality of super-4 posed silver halide emulsion layers sensitive to light of different colors, at least one of the layers being dyed by a dye which is fast to ordinary photographic treating solutions but capable of being locally bleached in the presence of a metallic silver image and which absorbs the total spectral range of light rays for which the layer is predominantly sensitized, a second one oi' said plurality of superposed light-sensitive layers arranged behind said fast dyed layer being transmittant for and sensitive to such light, and a lter dye of substantially the same color as said fast dye being present in a layer in front of the said second layer but not in front of said fast dyed layer, the absorption of said filter dye being greater than the absorption of said fast dye and said lter dye being removable by an agent which does not remove said fast dye.
  • a multilayer light-sensitive material comprising a support carrying a plurality o! superposed silver halide emulsion layers sensitive to light of different colors, at least one of the layers being dyed by a dye which is fast to ordinary photographic treating solutions but capable of being locally bleached in the presence of a metallic silver image and which absorbs the total spectral range of light rays for which the layer is predominantly sensitized, a second one of said plurality oi' superposed light-sensitive layers arranged behind said fast dyed layer being transmittant for and sensitive to such light, and a filter dye of substantially the same color as said fast dye being present in the said fast dyed lightsensitive emulsion layer, the absorption of said lter dye being greater -than the absorption of said fast dye and said filter dye being removable by an agent which does not remove said fast dye.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Optical Filters (AREA)
US243890A 1937-12-09 1938-12-03 Photographic material Expired - Lifetime US2219306A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB34079/37A GB507485A (en) 1937-12-09 1937-12-09 Photographic light-sensitive material for colour photography
GB34080/37A GB507151A (en) 1937-12-09 1937-12-09 Coloured photographic multilayer material
GB1656538 1938-12-05

Publications (1)

Publication Number Publication Date
US2219306A true US2219306A (en) 1940-10-29

Family

ID=27257396

Family Applications (1)

Application Number Title Priority Date Filing Date
US243890A Expired - Lifetime US2219306A (en) 1937-12-09 1938-12-03 Photographic material

Country Status (5)

Country Link
US (1) US2219306A (en))
BE (2) BE431546A (en))
DE (1) DE703260C (en))
FR (1) FR847291A (en))
GB (3) GB507151A (en))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486680A (en) * 1949-11-01 Chime
US3929487A (en) * 1966-10-03 1975-12-30 Harbans Singh Spectral balancing means for color photography
US4153459A (en) * 1973-11-16 1979-05-08 Eastman Kodak Company Hybrid color photographic elements and processes for developing same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486680A (en) * 1949-11-01 Chime
US3929487A (en) * 1966-10-03 1975-12-30 Harbans Singh Spectral balancing means for color photography
US4153459A (en) * 1973-11-16 1979-05-08 Eastman Kodak Company Hybrid color photographic elements and processes for developing same

Also Published As

Publication number Publication date
DE703260C (de) 1941-03-05
GB507485A (en) 1939-06-09
BE431548A (en)) 1939-01-31
GB507151A (en) 1939-06-09
FR847291A (fr) 1939-10-05
GB522190A (en) 1940-06-11
BE431546A (en)) 1939-01-31

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