US3265503A - Photographic recording element - Google Patents

Photographic recording element Download PDF

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Publication number
US3265503A
US3265503A US205642A US20564262A US3265503A US 3265503 A US3265503 A US 3265503A US 205642 A US205642 A US 205642A US 20564262 A US20564262 A US 20564262A US 3265503 A US3265503 A US 3265503A
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Prior art keywords
light
sensitive
layer
image
green
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US205642A
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Edward J Bodmer
Jr Cornelius J Murphy
Robert M Sterrett
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Eastman Kodak Co
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Eastman Kodak Co
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Priority to BE634037D priority Critical patent/BE634037A/xx
Priority to GB1051331D priority patent/GB1051331A/en
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Priority to US205642A priority patent/US3265503A/en
Priority to DE19631448785 priority patent/DE1448785A1/de
Priority to FR939556A priority patent/FR1362187A/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D15/00—Component parts of recorders for measuring arrangements not specially adapted for a specific variable
    • G01D15/14—Optical recording elements; Recording elements using X-or nuclear radiation
    • 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
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/46—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein having more than one photosensitive layer
    • 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
    • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials

Definitions

  • instruments of this type employ galvanometers provided with mirrors and the movements of the mirrors, which are responsive to fluctuation in an electric circuit, are caused to direct beams of light onto a moving film contained in a camera Where the recording is made.
  • galvanometers provided with mirrors and the movements of the mirrors, which are responsive to fluctuation in an electric circuit, are caused to direct beams of light onto a moving film contained in a camera Where the recording is made.
  • Such a system is described in Heiland US. Patent 2,580,427, issued January 1, 1952.
  • instruments which produce variable area light beams or light beams of variable intensity can be used.
  • printout elements used require special high intensity ultraviolet sources such as a Mercury Arc Osram Lamp for making the recording.
  • the black-and-white recording papers usually used have limited information storage capacity per unit area because superimposed signals become incoherent.
  • Another object is to provide a photographic recording element which does not require high intensity ultraviolet sources for exposure, but which is exposed with an ordinary tungsten light by using appropriate optical filters.
  • Another object is to provide a photographic recording element which has only two light-sensitive layers which are false sensitized and are capable of producing two colored images that are approximately complementary to one another, for maximum visual discrimination between the dye images and between each dye image and the neutral image that is formed by the combination of the two dye images.
  • Another object is to provide a process for producing a multichannel recording with our photographic recording element making one record( s) in a colored image, another record(s) in a colored image that is approximately the complement of the first colored image and a third record(s) that is approximately neutral in color.
  • our element comprises a support coated with a photographic silver halide emulsion layer sensitized to light in one part of the visible region of the spectrum,
  • these two light-sensitive layers are separated by a hydrophilic colloid layer such as gelatin or a gelatin substitute. It is advantageous to incorporate a non-difiusing reducing agent such as a ballasted hydroquinone derivative in this interlayer.
  • the element comprises a support coated with a photographic silver halide emulsion sensitized to blue light and containing incorporated yellow-forming coupler and magenta-forming coupler, a gelatin interlayer, and a green-sensitized silver halide emulsion containing incorporated cyan color-forming coupler.
  • the element contains a blue-sensitive layer with cyan-forming coupler and a green-sensitive layer with a yellow coupler and a magenta coupler, or a blue-sensitive layer with a cyan coupler and a yellow coupler and a green-sensitive layer with a magenta coupler, or a blue-sensitive layer with a cyan coupler and a magenta coupler and a green-sensitive layer with a yellow coupler, or a blue-sensitive layer with a magenta coupler and a green-sensitive layer incorporating a cyan coupler and a yellow coupler.
  • any of these elements described can have the green sensitive layer coated on the support with the interlayer and then the blue-sensitive layer on top.
  • the element can consist of a transparent support with one of the lightsensitive layers coated on one side and the second lightsensitive layer coated on the other side.
  • the support also serves as an interlayer.
  • a bleachable filter layer is incorporated in the element between the two light-sensitive layers containing a dye which transmits light in the region of the spectrum to which the lower light-sensitive layer is sensitive.
  • a dye which transmits light in the region of the spectrum to which the lower light-sensitive layer is sensitive.
  • the bleachable dye is incorporated in it.
  • the bleachable dye is incorporated on the support when it is between the lightsensitive layers.
  • the lightsensitive layers can have one or more strata of the type described in Millikan U.S. Serial No. 159,057, filed December 13, 1961.
  • one strata would be a high speed emulsion and the second strata a low speed emulsion both optically sensitized to the same portion of the spectrum and producing the same dye image.
  • the second light-sensitive layer can have one or more strata.
  • our invention includes the use of single couplers in place of the combination of couplers used in one of the light-sensitive layers, for example, a red color-forrning coupler can be used in place of the combination of a yellow-forming coupler and a magenta-forming coupler, a green color-forming coupler can be used in place of the combination of the yellow-forming coupler and cyan forming coupler, etc.
  • a red color-forrning coupler can be used in place of the combination of a yellow-forming coupler and a magenta-forming coupler
  • a green color-forming coupler can be used in place of the combination of the yellow-forming coupler and cyan forming coupler, etc.
  • the particular combination of light sensitivity of the emulsion and the color-forming coupler is not critical as long as color images produced can be readily discriminated. It is preferable to use couplers which will produce dyes in the two sensitive layers which are approximately complementary to each other.
  • hydrop-hilic colloid layer such as gelatin or a gelatin substitute coated on the outermost layer to provide physical protection for this layer.
  • various silver salts can be used as the sensitive salts, including silver bromide, silver iodide, silver chloride, or silver halides such as silver chlorobromide, silver bromoiodide, etc.
  • the emulsions can be chemically sensitized by any of the accepted procedures.
  • the emulsions can be digested with naturally lactive gelatin, or sulfur compounds can be added such as those described in Sheppard U.S. Patent 1,574,944, issued March 2, 1926; Sheppard et al. U.S. Patent 1,623,499, issued April 5, 1927; and Sheppard et a1.
  • U.S. Patent 2,410,689, isued November 5, 1946.
  • the emulsions can also be chemically sensitized with reducing agents such as stannous salts (Carroll U.S. Patent 2,487,850, issued November 15, 1949), polyamines, such as diethyl triamine (Lowe and Jones U.S. Patent 2,518,- 698, issued August 15, 1950), polyamines, such as sper mine (Lowe and Allen U.S. Patent 2,521,925, issued September 12, 1950), or bis(B-aminoethyl)sulfide and its water-soluble salts (Lowe and Jones U.S. Patent 2,521,- 926, issued September 12, 1950).
  • reducing agents such as stannous salts (Carroll U.S. Patent 2,487,850, issued November 15, 1949), polyamines, such as diethyl triamine (Lowe and Jones U.S. Patent 2,518,- 698, issued August 15, 1950), polyamines, such as sper mine (Lowe and Allen U.S. Patent 2,521,925, issued September 12, 1950), or bis
  • the carrier for the silver halide in its preparation there may be employed as the carrier for the silver halide in its preparation, gelatin or some other colloidal material such as colloidal albumin, a cellulose derivative, or a synthetic resin, for instance, a polyvinyl compound.
  • colloidal albumin a cellulose derivative
  • synthetic resin for instance, a polyvinyl compound.
  • colloids which may be used are polyvinyl alcohol or a hydrolyzed polyvinyl acetate as described in Lowe U.S. Patent 2,286,215, issued June 16, 1942; a far hydrolyzed cellulose ester such as cellulose acetate hydrolyzed to tan acetyl content of 1926% as described in U.S.
  • Patent 2,326,808 of Lowe and Clark issued August 24, 1943, a water-soluble ethanolamine cellulose acetate as described in Yutzy U.S. Patent 2,322,085, issued June 15, 1943; a polyacryllamine having a combined acrylamide content of 30-60% and a specific viscosity of 025-15 on an imidized polyacrylamide of like :acrylamide content and viscosity as described in Lowe, Minsk and Kenyon U.S. Patent 2,541,474, issued February 13, 1951; zein as described in Lowe U.S. Patent 2,563,791, issued August 7, 1951; a vinyl alcohol polymer containing urethane carboxylic acid groups of the type described in Unruh and Smith U.S.
  • Patent 2,768,154 issued October 23, 1956; or containing cyano-acetyl groups such as the vinyl alcoholvinyl cyanoacetate copolymer as described in Unruh, Smith and Priest U.S. Patent 2,808,331, issued October 1, 1957; or a polymeric material which results from polymerizing a protein or a saturated acylated protein with a monomer having a vinyl group as described in U.S. Patent 2,852,382, of Illingsworth, Dann and Gates, issued September 16, 1958.
  • cyano-acetyl groups such as the vinyl alcoholvinyl cyanoacetate copolymer as described in Unruh, Smith and Priest U.S. Patent 2,808,331, issued October 1, 1957; or a polymeric material which results from polymerizing a protein or a saturated acylated protein with a monomer having a vinyl group as described in U.S. Patent 2,852,382, of Illingsworth, Dann and Gates, issued September 16, 1958.
  • Patent 2,519,001 such as 5-[(3-fl-carboxyethyl-2(3)-benzothiazolylidene) ethylidene]-3-ethyl-l-phenyl-Z-thiohydantoin, etc.; the cyanine dyes of Sprague U.S. Patent 2,503,776, issued April 11, 1950, such as anhydro-S- chloro 1 ethyl-3-fl-sulfoethylthia-2'-cyanine hydroxide, etc., and other sensitizers well known in the art.
  • blue sensitizers include acid merocyanines of Brooker et al. U.S. Patent 2,493,747, issued January 10, 1950, such as 4[(5-chloro-3-ethyl-2(3)-benzothiazolylidene) or ethylethylidene]-3-methyl-1-(p-sulfophenyD-S-pynazolone, etc.; the merocyanines of Brooker et al. U.S. Patent 2,493,748, such as 3-carboxymethyl 5 (3-ethy1-2(3)-benzothiazolylidene)rhodanine, etc., and other sensitizers well known in the art.
  • our silver halide emulsions can be sensitized to light of other wavelengths than to green or to blue so long as the exposing light can be filtered so that one emulsion can be preferentially exposed Without exposing the other emulsion.
  • Sensitizing dyes having maximum sensitizing efiects at other wavelengths and which can be used in our elements are found in the sensitizer references given and in other references, such as are described in Brooker U.S. Patents 1,846,301 and 1,846,302, both issued on February 23, 1932; 1,942,- 854, issued January 9, 1934; White U.S. Patent 1,990,507, issued February 12, 1935; Brooker and White U.S. Patent 2,165,338, issued July 11, 1939; and many others.
  • Typical color-forming compounds or couplers which are useful in our recording elements include the following:
  • Couplers producing cyan images 5- (p-amylphenoxybenzenesulfonamino) -1-naphthol 5- N-benzyl-N-naphthalenesulfonamino) 1 -riaphthol 5-(n-benzy-N-n-valeryliarnino)-1-naphthol 5 -caproylaminol-nlaphthol 2-chloro-5-(N-n-valeryl-N-p-isopropylbenzylamino) -1- naphthol 2,4-dichloro-5- (p-nitrobenzoyl-fi-o-hydroxyethylamino l-naphthol 2,4-d1Chll0l'O-5 -palmitylaminol-nap hthol 2,2'-dihydroxy-5 ,5 '-dibromostilbene 5-dip henylethersulfonamido- 1 -n
  • coupler compounds are dissolved in appropriate solvents and dispersed in a hydrophilic colloid as described by Jelley et al. in U.S. Patent 2,322,027, issued June 15, 1943.
  • any of the bleachable filter dyes having appropriate transmission characteristics are used to advantage in the intermediate hydrop-hilic colloid layer when it is desired to incorporate a filter in the element.
  • These dyes are bleached by the solutions used in developing and fixing. Included among the bleachable dyes used are the unsymmetrical oxonol dyes of Keyes et al. U.S. Patent 2,611,- 696, issued September 23, 1952; the styryl dyes of Sprague U.S. Patent 2,622,082, issued December 16, 1952; the pyrrole dyes of Reed U.S. Patent 2,725,378, issued November 29, 1955; the merocyanine dyes of Silberstein et al. U.S. Patent 2,527,583, issued October '31, 1950; and many other bleachable dyes Well known in the art.
  • hydrophilic materials such as gelatin and gelatin substitutes used in making the silver halide emulsions can be used to advantage for the interlayer and the overcoat layers of our recording elements.
  • Nondiifusing reducing agents used to advantage in our interlayer must not be detrimental to the light-sensitive layers and their oxidized form should preferably not be reactive with the color-forming couplers. Included among these compounds are the higher alkyl substituted hydroquinone compounds of Crevling et a1.
  • a wide variety of supports can be used for making our elements, including typical photographic supports, such as conventional paper or paper supports coated with a water resistant layer such as polyethylene, polymeric hydrosols (cg. U.S. Patent 3,021,214) etc., cellulose nitrate film, cellulose acetate film, polyvinyl acetal film, polystyrene film, polyethyleneterephthalate film, etc.
  • typical photographic supports such as conventional paper or paper supports coated with a water resistant layer such as polyethylene, polymeric hydrosols (cg. U.S. Patent 3,021,214) etc.
  • cellulose nitrate film cellulose acetate film
  • polyvinyl acetal film polystyrene film
  • polyethyleneterephthalate film etc.
  • Our photographic recording element is used to advantage in the various recording instruments, playback equipment, multi-channel oscillographs or any other apparatus capable of producing a light signal from an electrical input signal.
  • a conventional tungsten light source is used unfiltered for one-recording beam, another beam is filtered with a filter that will pass light to which only the first of the two light-sensitive layers is sensitive, and a third beam is filtered with another filter which will pass light to which only the second of the two sensitive layers is sensitive.
  • Our exposed element is developed in a developer in which a phenylenediamine type developing agent is used, then fixed in aconventional sodium thiosulfate fixing bath, and bleached with either a conventional type bleach with sodium ferricyanide as the bleaching agent or with ferric chloride as the bleaching agent.
  • a gel sized strip of photographic paper support was coated with a layer comprising an ordinary gelatino silver chlorobromide Washed emulsion sensitized to blue light into which was intimately blended two separate dispersions in gelatin, one containing a dispersion. (made as described in J elley et al. U.S. Patent 2,322,027, issued June 15, 1943) of a solvent solution of a magenta-forming coupler and the other containing a solvent solution of a yellow-forming coupler, such that approximately equal amounts of the couplers were present.
  • This layer was coated with a gelatin interlayer containing a dispersion of dioctyl hydroquinone.
  • the interlayer was coated with a layer comprising an ordinary gelatino silver chlorobromide emulsion sensitized to green light and intimately blended with a dispersion (made as described by Jelley et al.) of a solvent solution of the cyan-forming coupler in gelatin.
  • This layer was coated with a :gelatin overcoat.
  • EXAMPLE 2 The photographic recording element of Example 1 was exposed in a multichannel oscillograph in which three separate records were made with light beams reflected from three galvanometer actuated mirrors. One light beam was tungsten light passed through a blue Wratten No. 34 filter, another light beam was tungsten light passed through a green Wratten No. 12 filter, and a third beam was unfiltered tungsten light.
  • Potassium ferricyanide g 60.0 Disodium phosphate g 13.0 Monosodium phosphate g 5.0 Sodium bromide g 15.0 Water l 1.0 (4) 3 minutes water Wash at 100 F., and (5) Dry.
  • a good three channel record was obtained by processing our exposed element.
  • the record made with the blue light beam was red
  • the record made with the green light beam was cyan
  • the record made with the unfiltered light beam was a neutral density.
  • Each record was clearly distinguishable from the other two.
  • the developing agent 4-amino-N-ethyl-N(,8- methanesulfonamidoethyl) m toluidine sesquisulfate i on r 9' monohydrate used in the developer solution of Example 1 can be replaced with other conventional p-phenylenediamine developing agent, such as 4-amino-N-ethyl-N-[i-hydroxyethyl-F:-methylaniline sulfuric acid salt,
  • All of these developing agents are characterized by having one primary amine group.
  • Example 3 An element of Example 1 was exposed in Example 2 and processed in the Kodak Color Print Process P-122 used by Photofinishing Laboratories to give good records like those obtained in Example 2.
  • each of these elements can be altered by interchanging the physical position of the light-sensitive layers, for example, (d) can be changed as follows:
  • FIGS. '1 and 2 showing cross sections of a typical element being used according to our invention.
  • FIG. 1 shows one of our photographic recording elements comprising paper support 17 coated with a bluesensitive silver halide emulsion layer 16 with incorporated yellow-forming coupler and magenta-forming coupler in approximately equal amounts, coated with gelatin interlayer 15, coated with green-sensitive silver halide emulsion layer 14 with incorporated cyan-forming coupler, coated with gelatin overcoat layer 13 being exposed with a beam of unfiltered tungsten light, a beam of green filtered tungsten light, and a beam of blue filtered tungsten light in an oscillograph.
  • FIG. 2 shows the images formed in the element exposed in FIG. 1 by development.
  • the cyan dye image 18 in layer 14 and the combined yellow and magenta dye image 19 in layer 16 formed by development of the white light exposed element produced a neutral density image While the cyan dye image in layer 14 was formed by development of the element exposed to green filtered light, and the red (that is, yellow and magenta) dye image 19 in layer 16 was formed by development of the element exposed to blue filtered light.
  • Our photographic recording elements are valuable for use in recording instruments, playback equipment, multichannel oscillographs or any other apparatus capable of producing a light signal from an electrical imput signal.
  • Our elements provide increased information storage per unit area over the conventional black-and-white elements.
  • the two dye images formed are complementary in color and therefore they contrastwith one another as much as possible as well as With the neutral density image that is produced by developing areas of the element that were exposed to White light.
  • Our element does not require the special high intensity ultraviolet light sources many of the prior art recording papers need for exposure.
  • a photographic element with two light-sensitive layers comprising .a photographic support having coated thereon:
  • one blue light-sensitive colored-image-forming layer comprising
  • a color-forming coupler composition selected from the class consisting of those producing a cyan dye image, and those producing a red dye image;
  • a color-forming coupler composition selected from the class consisting of those producing a cyan dye image and those producing a red dye image, such that the colored image formed in the first mentioned layer is complementary to the colored image formed in the second mentioned layer so that when combined they form a black image.
  • a photographic element of claim 1 in which the support is transparent and the blue-sensitive layer is coated on one side and the green-sensitive layer is coated on the other side.
  • one blue light-sensitive colored-image-forming layer comprising
  • a color-forming coupler composition selected from the class consisting of those producing a cyan dye image, and those producing a red dye image;
  • a color-forming coupler composition selected from the class consisting of those producing a cyan dye image and those producing a red dye image, such that the colored image formed in the first mentioned layer is complementary to the colored image iormed in the second mentioned layer so that when combined they form a black image; said process comprising the steps of:

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
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  • Engineering & Computer Science (AREA)
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US205642A 1962-06-27 1962-06-27 Photographic recording element Expired - Lifetime US3265503A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE634037D BE634037A (bs) 1962-06-27
GB1051331D GB1051331A (bs) 1962-06-27
US205642A US3265503A (en) 1962-06-27 1962-06-27 Photographic recording element
DE19631448785 DE1448785A1 (de) 1962-06-27 1963-05-29 Verfahren zur Auszeichnung von zeitlich veraenderlichen elektrischen Vorgaengen in einem registrierenden Instrument und Material zur Durchfuehrung des Verfahrens
FR939556A FR1362187A (fr) 1962-06-27 1963-06-27 Nouveau produit d'enregistrement photographique

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US205642A US3265503A (en) 1962-06-27 1962-06-27 Photographic recording element

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US3265503A true US3265503A (en) 1966-08-09

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US205642A Expired - Lifetime US3265503A (en) 1962-06-27 1962-06-27 Photographic recording element

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BE (1) BE634037A (bs)
DE (1) DE1448785A1 (bs)
FR (1) FR1362187A (bs)
GB (1) GB1051331A (bs)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335004A (en) * 1963-12-09 1967-08-08 Eastman Kodak Co Method for stabilization processing of color emulsions
US3486890A (en) * 1965-06-09 1969-12-30 Gaf Corp Color oscillograph recording paper containing a color developing agent
US3490904A (en) * 1965-06-07 1970-01-20 Gaf Corp Color oscillograph recording paper
US3499758A (en) * 1965-06-07 1970-03-10 Gaf Corp Color oscillograph recording paper
US4042394A (en) * 1973-05-07 1977-08-16 Eastman Kodak Company Photographic dye image stabilization
US4455369A (en) * 1982-10-19 1984-06-19 Purro Norina M Method of creating image on light sensitive sheet
WO1996025691A1 (en) * 1995-02-16 1996-08-22 Orangeacre Limited Manufacture of coloured sheet material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB562854A (en) * 1942-08-12 1944-07-19 Kodak Ltd Improvements in photographic sensitive material and in colour correcting masks produced therefrom
US2705200A (en) * 1950-11-15 1955-03-29 Gen Aniline & Film Corp Bipack color film containing nondiffusing color formers and processing thereof
US2760404A (en) * 1953-12-31 1956-08-28 Internat Telemeter Corp Photographic memory
US2997388A (en) * 1957-07-17 1961-08-22 Du Pont Lippmann emulsion masking process
US3035913A (en) * 1956-09-26 1962-05-22 Agfa Ag Photographic tone correction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB562854A (en) * 1942-08-12 1944-07-19 Kodak Ltd Improvements in photographic sensitive material and in colour correcting masks produced therefrom
US2705200A (en) * 1950-11-15 1955-03-29 Gen Aniline & Film Corp Bipack color film containing nondiffusing color formers and processing thereof
US2760404A (en) * 1953-12-31 1956-08-28 Internat Telemeter Corp Photographic memory
US3035913A (en) * 1956-09-26 1962-05-22 Agfa Ag Photographic tone correction
US2997388A (en) * 1957-07-17 1961-08-22 Du Pont Lippmann emulsion masking process

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335004A (en) * 1963-12-09 1967-08-08 Eastman Kodak Co Method for stabilization processing of color emulsions
US3490904A (en) * 1965-06-07 1970-01-20 Gaf Corp Color oscillograph recording paper
US3499758A (en) * 1965-06-07 1970-03-10 Gaf Corp Color oscillograph recording paper
US3486890A (en) * 1965-06-09 1969-12-30 Gaf Corp Color oscillograph recording paper containing a color developing agent
US4042394A (en) * 1973-05-07 1977-08-16 Eastman Kodak Company Photographic dye image stabilization
US4455369A (en) * 1982-10-19 1984-06-19 Purro Norina M Method of creating image on light sensitive sheet
WO1996025691A1 (en) * 1995-02-16 1996-08-22 Orangeacre Limited Manufacture of coloured sheet material

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FR1362187A (fr) 1964-05-29
BE634037A (bs)
DE1448785A1 (de) 1968-10-31

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