US3154416A - Photographic process - Google Patents

Photographic process Download PDF

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Publication number
US3154416A
US3154416A US99413A US9941361A US3154416A US 3154416 A US3154416 A US 3154416A US 99413 A US99413 A US 99413A US 9941361 A US9941361 A US 9941361A US 3154416 A US3154416 A US 3154416A
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United States
Prior art keywords
layer
dye
group
light
solution
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Expired - Lifetime
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US99413A
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English (en)
Inventor
Fidelman J George
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Horizons Inc
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Horizons Inc
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Publication date
Application filed by Horizons Inc filed Critical Horizons Inc
Priority to US99413A priority Critical patent/US3154416A/en
Priority to GB11938/62A priority patent/GB991023A/en
Priority to DEH45326A priority patent/DE1221559B/de
Priority to FR892862A priority patent/FR1318555A/fr
Priority to BE653387A priority patent/BE653387A/xx
Application granted granted Critical
Publication of US3154416A publication Critical patent/US3154416A/en
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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
    • G03C1/00—Photosensitive materials
    • G03C1/675—Compositions containing polyhalogenated compounds as photosensitive substances
    • 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
    • G03C7/02—Direct bleach-out processes; Materials therefor; Preparing or processing such materials

Definitions

  • This invention relates to a non-silver direct-positive dye-bleach photographic process wherein both full-color transparencies and full-color prints on a white opaque substrate are produced with images which are sharp and distinct, and to the materials from which the color transparencies and color prints are produced.
  • the principal object of the present invention is to provide means whereby images which are intense, sharp cutting, and in brilliant colors, with good color separation, yieldin a very high-quality color rendition are reproducibly obtained and which eliminate the loss in sensitivity and color-separation occasionally experienced in directpositive non-silver dye-bleach photographic systems.
  • One object of this invention is to provide a non-silver direct-positive dye-bleach photographic system capable of producing full color photographic prints.
  • Still another object of the invention is to provide a relatively simple photosystem wherein full-color direct positive prints are produced solely by the action of the exposing light without any chemical development.
  • Still another object of the invention is to provide a process wherein the colored image produced may be stabilized and fixed by a simple heat treatment.
  • a still further object of this invention is to provide a process for producing positive transparencies in full color, either for projection or for color prints when coated on a white opaque substrate.
  • a still further object of the invention is to provide a simple photosystem for the production of office copy.
  • FIGURE 1 diagrammatically illustrates the efiect of exposure of a tripack to light of various colors
  • FIGURE 2 schematically shows the resulting direct positive obtained after the exposure of FIGURE. 1;
  • FIGURES 3 and 4 each show a modified tripack which may be used in place of that shown in FIGURE 1.
  • a direct positive full color print may be obtained byutilization of an integral tripack of three sensitive layers.
  • Any of the layers may also include extraneous materials added for specific purposes, e.g. to alter the speed of the system.
  • a green sensitive layer may be obtained with the process, using a magenta dye, which is, of course, green absorbing, transmitting blue and red freely.
  • a magenta dye which is, of course, green absorbing, transmitting blue and red freely.
  • the action of green light on this layer is to bleach the magenta dye. It is not, of course, aifected by blue or red light; light of these wavelengths is not absorbed by the sensitive material.
  • What is obtained in this layer therefore, is a minus-green record which corresponds, for example, with the magenta printer in conventional color printing processes.
  • a blue-sensitive layer comprising a yellow dye, is bleached on exposure to blue light, giving a minusblue record which corresponds to the yellow printer in conventional printing processes.
  • a red-sensitive layer containing a cyan dye, is bleached by red light, giving a minus-red image corresponding to the cyan printer in color printing processes.
  • the three-layer integral tripack, depicted in FIGURE 1 consists of three light-sensitive layers superimposed, one on top of the other.
  • the coating nearest the substrate is a blue-sensitive yellow dye labelled A
  • the coating on top of this is a green-sensitive magenta dye labelled B
  • the topmost coating is a red-sensitive cyan dye labelled C.
  • the cyan layer will absorb red light; the magenta layer will absorb green light; while both the cyan layer and magenta layer will transmit blue freely, as shown in Fl URE 2.
  • the result is reflection or transmission of only blue in the area which was originally struck by blue light; in other words, a direct positive is obtained.
  • the cyan dye will transmit the green freely while the magenta dye will absorb the green light and be bleached. Since the cyan dye and the yellow dye are still intact and the former will absorb red while the latter will absorb blue, the net reflection or transmission from the bleached layer will be green; again, a direct positive.
  • the cyan dye will absorb this radiation and be bleached. The greenand blue-sensitive layers will be unaffected. The magenta dye will absorb the green light, the yellow dye will absorb the blue light, and the net reflection from the combined three layers will be red.
  • the three-layer integral tripack depicted in FIGURE 1 comprises three light-sensitive layers superimposed on one another on a suitable base material.
  • a suitable base material to insure that the sensitivity of the tripack is not diminished or even entirely lost by undesirable reactions, which may occur when materials from more than one layer of the tripack are permitted to intermingle even to a limited extent, I have devised modes of preparation of the tripack which preserve the photosensitivity and which yield images with good color separation.
  • intermingling of the dye-bleach materials of the tripack shown in FIGURE 1 is avoided by selecting solvents, vehicles and carriers so that successive layers are formulated from materials which do not dissolve or penetrate into the solid substrate to which they are applied.
  • intermingling of the dye-bleach materials is avoided by interposing a barrier layer between successive photosensitive layers.
  • a film of a suitable substrate eg a mil sheet of clear or white cellulose acetate film, is flooded on one side for three seconds with a cyan dye solution; the excess solution is then poured off.
  • the coated film is dried for about one minute in a stream of air at 50 C., e.g. by suspending the wet coated film in a suitable drying oven.
  • a barrier layer is formed on the cyan layer by coating a plastic layer onto the cyan layer from a suitable coating solution.
  • a barrier layer is applied to the magenta layer by coating a plastic layer onto the magenta layer from a suitable coating solution.
  • the plastic layer is dried by baking as before.
  • the coated film is dried in a stream of air at 50 C. for about one minute.
  • the essential and necessary compositional limitation which must be observed is that, in laying down any layer, care must be exercised that the liquid coating formulation be free from any material which acts as a solvent for the dye in the layer on which the liquid is being deposited.
  • the essential constituents are (1) an organic halogen-containing compound such as those represented by the general formula RC-X wherein R is a monovalent radical selected from the group consisting of hydrogen, chlorine, bromine, iodine, alkyl, substituted alkyl, aryl and substituted aryl, and each X is selected from the group consisting of Cl, Br and I; and (2) a dye which bleachs when exposed to light of a suitable wavelength in the presence of the compound (1).
  • R is a monovalent radical selected from the group consisting of hydrogen, chlorine, bromine, iodine, alkyl, substituted alkyl, aryl and substituted aryl, and each X is selected from the group consisting of Cl, Br and I
  • a complex may be formed between the halogen-containing compound and the bleachout dye which may require less energy to raise it to an excited state to permit the desired photolytic reaction to take place than when such complexes do not form.
  • the dyes of the present invention are bleached when 4 exposed to light, giving as described above a direct positive image. Furthermore, the bleachout process of this invention requires no solvent extraction for fixation to render the dye image permanent; a short heating period only is needed to destroy any sensitivity remaining in the system after exposure to visible light.
  • Organic halogen-containing compounds which are suitable in the photographic systems of this invention include carbon tetrabrornide, pentabromoethane, carbon tetrachloride, carbon tetraioclide, iodoform, bromoform, chloroform, hexachlorethane, bromotrichloromethane, benzotribromide, and similarly polyhalogenated hydrocarbon compounds in which at least three halogen atoms are attached to a single carbon atom.
  • the bleachout dyes useful in the photosystems of this invention are polymethine dyes such as the cyanines, carbocyanines, merocyanines, styryl dyes and their higher vinylene homologs.
  • plastic supports may be used in place of the 10 mil cellulose acetate, which is preferred.
  • plastic coated paper, Mylar (a polyester), polyvinylchloride and a variety of other plastics could be used, provided the bleachout dye solution is suitably formulated.
  • Example 1 The coating procedure for producing a color-sensitized film was as follows:
  • a sheet of lO-mil clear cellulose acetate film was flooded on one side for three seconds with a solution of 37 mg. of the cyan dye, l',3-diethylthia-4'-carbocyanine iodide, and 10 mg. of carbon tetrabromide in 7 cc. of a mixture of equal parts by volume of methanol, acetone and dimethylformamide, then excess solution was poured off.
  • the dyed wet film was dried for one minute in a stream of air at 50 C.
  • a plastic interlayer solution consisting of a 10% solution of ethylcellulose (Hercules Type N, 4.5 c.p.s.) in toluene was poured over the first coating and, after 3 seconds contact, the excess solution was poured off and the coated strip was dried (baked) for two minutes in a stream of air at 50 C.
  • ethylcellulose Hercules Type N, 4.5 c.p.s.
  • the resulting film was exposed under a multicolored subject using an RFL No. 2 photoflood lamp at a distance of 10 inches as light source.
  • the transparency was accurately duplicated as a direct positive on exposure for 10 minutes.
  • methylcellulose e.g. methylcellulose, polystyrene, and the like.
  • Example 2 seconds contact with excess solution, the film was hung up to dry for two minutes in a stream of air at 50 C.
  • ethylcellulose plastic used for the separating layer
  • suitable plastics e.g. methylcellulose, polystyrene, and the like.
  • Example 3 The following coatings were applied successively to one side of a sheet of l0-mil white-pigmented cellulose acetate, in the order mentioned:
  • the sheet was first flooded for three seconds with a solution or" 7 mg. of the cyan dye, 1,3-diethylthia-4- carbocyanine iodide, and mg. of carbon tetrabromide in 18 cc. of a mixture of equal parts of acetone, ethanol, and dimethylformamide.
  • the sheet was dried in a stream of air at 50 C. for one minute.
  • the sensitized sheets thus obtained were used to make contact prints, in color, from color transparencies and also to make projection-enlargement copies, in color, of a number or" -min. color-transparency subjects.
  • ethylcellulose plastic used for the separating layer
  • suitable plastics e.g. methylcellulose, polystyrene, and the like.
  • An article comprising a support member and at least two photosensitive layers supported thereon as follows:
  • a binder-free first photosensitive layer on said substrate consisting essentially of (1) an organic halogen containing compound selected from the group consisting of alkyl and aralkyl compounds in which at least three halogen atoms are attached to a single carbon atom, said halogens being selected from the group consisting of Cl, Br and I, and (2) a bleachable polymethine dye selected from the group consisting of cyanines, carbocyanines, merocyanines, styryl dyes and their high vinylene homologs;
  • a photoinsensitive layer of clear plastic coated on said first layer said plastic having been deposited on said first layer from a solution of said plastic formulated from materials which do not dissolve or pene trate into the first layer when the solution was applied thereto;
  • said second photosensitive layer consisting essentially of an organic halogen containing compound selected from the group consisting of alkyl and aralkyl compounds in which at least three halogen atoms are attached to a single carbon atom, said halogens being selected from the group consisting of Cl, Br and l, and a bleachable polymethine dye selected from the group consisting of cyanines, carbocyanines, merocyanines, styryl dyes and their higher vinylene homologs and sensitive to light of Wavelengths different from those to which the dye in said first layer is sensitive, the organic halogen containing compounds in said first and second layers being present in an amount suflicient to accelerate the bleaching out of said dyes when exposed to radiation absorbed by said dyes.
  • the article of claim 1 including in addition a second photoinsensitive layer as a film of clear plastic deposited on said second photosensitive layer from a solution formulated of materials which do not dissolve or penetrate into said second photosensitive layer when the solution is applied thereto and a binder-free third photosensitive layer consisting essentially of organic halogen compound selected from the group consisting of alkyl and aralkyl compounds in which at least three halogen atoms are attached to a single carbon atom, said halogens being selected from the group consisting of Cl, Br
  • bleachable polymethine dye selected from the group consisting of cyanines, carbocyanines, merocyanines, styryl dyes and their higher vinylene homologs and wherein said dye is sensitive to light of wave-lengths difierent from those to which the dyes in said first and second layers are sensitive.
  • the article of claim 1 including in addition a binder-free third photosensitive layer on the uncoated face of said support member; said third photosensitive layer consisting essentially of organic halogen compound selected from the group consisting of alkyl and aralkyl compounds in which at least three halogen atoms are attached to a single carbon atom, said halogens being selected from the group consisting of Cl, Br and I, and bleachable polymethine dye selected from the group consisting of cyanines, carbocyanines, merocyanines, styryl dyes and their higher vinylene homologs and wherein said dye is sensitive to light of wave-lengths diiierent from those to which the dyes in said first and second layers are sensitive.
  • organic halogen compound selected from the group consisting of alkyl and aralkyl compounds in which at least three halogen atoms are attached to a single carbon atom, said halogens being selected from the group consisting of Cl, Br and I
  • bleachable polymethine dye selected
  • a method of preparing a photosensitive element comprising a support member and at least two photosensitive layers supported thereon comprising: depositing a binder-free first layer on said substrate from a solution containing a bleach-out dye selected from the group consisting of cyanines, carbocyanines, merocyanines, styryl dyes and their higher vinylene homologs and an organic halogen-containing compound selected from the group consisting of alkyl and aralltyl compounds in which at least three halogen atoms are attached to a single carbon atom, said halogens being selected from the group consisting of Cl, Br and I; removing the solvent from said layer by drying; depositing a photoinsensitive layer comprising a film of clear plastic laid down on said dried layer by applying a solution of said plastic formulated from materials which do not dissolve or penetrate said layer to which the clear plastic layer is applied; and depositing a binder-free second photosensitive layer on said photoinsensitive layer from a solution containing a leach-out dye selected from the

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
US99413A 1961-03-30 1961-03-30 Photographic process Expired - Lifetime US3154416A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US99413A US3154416A (en) 1961-03-30 1961-03-30 Photographic process
GB11938/62A GB991023A (en) 1961-03-30 1962-03-28 Process for preparing photosensitive elements
DEH45326A DE1221559B (de) 1961-03-30 1962-03-30 Silberhalogenidfreies, photographisches Kopiermaterial mit Ausbleichschichten
FR892862A FR1318555A (fr) 1961-03-30 1962-03-30 Perfectionnements à un procédé photographique direct pour l'obtention d'images positives
BE653387A BE653387A (xx) 1961-03-30 1964-09-22

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US3154416A true US3154416A (en) 1964-10-27

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GB (1) GB991023A (xx)

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305361A (en) * 1962-12-28 1967-02-21 Gen Electric Information recording
US3485630A (en) * 1966-01-21 1969-12-23 Gen Electric Method of etching a metal layer coated with a layer containing a photolytic halogen liberator and a bleachable organic dye
US5616443A (en) * 1993-08-05 1997-04-01 Kimberly-Clark Corporation Substrate having a mutable colored composition thereon
US5643356A (en) * 1993-08-05 1997-07-01 Kimberly-Clark Corporation Ink for ink jet printers
US5645964A (en) * 1993-08-05 1997-07-08 Kimberly-Clark Corporation Digital information recording media and method of using same
US5681380A (en) * 1995-06-05 1997-10-28 Kimberly-Clark Worldwide, Inc. Ink for ink jet printers
US5686503A (en) * 1994-06-30 1997-11-11 Kimberly-Clark Corporation Method of generating a reactive species and applications therefor
US5700850A (en) * 1993-08-05 1997-12-23 Kimberly-Clark Worldwide Colorant compositions and colorant stabilizers
US5721287A (en) * 1993-08-05 1998-02-24 Kimberly-Clark Worldwide, Inc. Method of mutating a colorant by irradiation
US5733693A (en) * 1993-08-05 1998-03-31 Kimberly-Clark Worldwide, Inc. Method for improving the readability of data processing forms
US5739175A (en) * 1995-06-05 1998-04-14 Kimberly-Clark Worldwide, Inc. Photoreactor composition containing an arylketoalkene wavelength-specific sensitizer
US5747550A (en) * 1995-06-05 1998-05-05 Kimberly-Clark Worldwide, Inc. Method of generating a reactive species and polymerizing an unsaturated polymerizable material
US5773182A (en) * 1993-08-05 1998-06-30 Kimberly-Clark Worldwide, Inc. Method of light stabilizing a colorant
US5782963A (en) * 1996-03-29 1998-07-21 Kimberly-Clark Worldwide, Inc. Colorant stabilizers
US5786132A (en) * 1995-06-05 1998-07-28 Kimberly-Clark Corporation Pre-dyes, mutable dye compositions, and methods of developing a color
US5798015A (en) * 1995-06-05 1998-08-25 Kimberly-Clark Worldwide, Inc. Method of laminating a structure with adhesive containing a photoreactor composition
US5811199A (en) * 1995-06-05 1998-09-22 Kimberly-Clark Worldwide, Inc. Adhesive compositions containing a photoreactor composition
US5837429A (en) * 1995-06-05 1998-11-17 Kimberly-Clark Worldwide Pre-dyes, pre-dye compositions, and methods of developing a color
US5849411A (en) * 1995-06-05 1998-12-15 Kimberly-Clark Worldwide, Inc. Polymer film, nonwoven web and fibers containing a photoreactor composition
US5855655A (en) * 1996-03-29 1999-01-05 Kimberly-Clark Worldwide, Inc. Colorant stabilizers
US5865471A (en) * 1993-08-05 1999-02-02 Kimberly-Clark Worldwide, Inc. Photo-erasable data processing forms
US5885337A (en) * 1995-11-28 1999-03-23 Nohr; Ronald Sinclair Colorant stabilizers
US5891229A (en) * 1996-03-29 1999-04-06 Kimberly-Clark Worldwide, Inc. Colorant stabilizers
US6008268A (en) * 1994-10-21 1999-12-28 Kimberly-Clark Worldwide, Inc. Photoreactor composition, method of generating a reactive species, and applications therefor
US6017661A (en) * 1994-11-09 2000-01-25 Kimberly-Clark Corporation Temporary marking using photoerasable colorants
US6017471A (en) * 1993-08-05 2000-01-25 Kimberly-Clark Worldwide, Inc. Colorants and colorant modifiers
US6033465A (en) * 1995-06-28 2000-03-07 Kimberly-Clark Worldwide, Inc. Colorants and colorant modifiers
US6071979A (en) * 1994-06-30 2000-06-06 Kimberly-Clark Worldwide, Inc. Photoreactor composition method of generating a reactive species and applications therefor
US6099628A (en) * 1996-03-29 2000-08-08 Kimberly-Clark Worldwide, Inc. Colorant stabilizers
US6211383B1 (en) 1993-08-05 2001-04-03 Kimberly-Clark Worldwide, Inc. Nohr-McDonald elimination reaction
US6228157B1 (en) 1998-07-20 2001-05-08 Ronald S. Nohr Ink jet ink compositions
US6242057B1 (en) 1994-06-30 2001-06-05 Kimberly-Clark Worldwide, Inc. Photoreactor composition and applications therefor
US6265458B1 (en) 1998-09-28 2001-07-24 Kimberly-Clark Worldwide, Inc. Photoinitiators and applications therefor
US6277897B1 (en) 1998-06-03 2001-08-21 Kimberly-Clark Worldwide, Inc. Photoinitiators and applications therefor
US6294698B1 (en) 1999-04-16 2001-09-25 Kimberly-Clark Worldwide, Inc. Photoinitiators and applications therefor
US6331056B1 (en) 1999-02-25 2001-12-18 Kimberly-Clark Worldwide, Inc. Printing apparatus and applications therefor
US6368396B1 (en) 1999-01-19 2002-04-09 Kimberly-Clark Worldwide, Inc. Colorants, colorant stabilizers, ink compositions, and improved methods of making the same
US6368395B1 (en) 1999-05-24 2002-04-09 Kimberly-Clark Worldwide, Inc. Subphthalocyanine colorants, ink compositions, and method of making the same
US6486227B2 (en) 2000-06-19 2002-11-26 Kimberly-Clark Worldwide, Inc. Zinc-complex photoinitiators and applications therefor
US6503559B1 (en) 1998-06-03 2003-01-07 Kimberly-Clark Worldwide, Inc. Neonanoplasts and microemulsion technology for inks and ink jet printing
US6524379B2 (en) 1997-08-15 2003-02-25 Kimberly-Clark Worldwide, Inc. Colorants, colorant stabilizers, ink compositions, and improved methods of making the same

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US1517049A (en) * 1919-09-06 1924-11-25 Christensen Jens Herman Film and method for the production of colored pictures
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Cited By (59)

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Publication number Priority date Publication date Assignee Title
US3305361A (en) * 1962-12-28 1967-02-21 Gen Electric Information recording
US3485630A (en) * 1966-01-21 1969-12-23 Gen Electric Method of etching a metal layer coated with a layer containing a photolytic halogen liberator and a bleachable organic dye
US6066439A (en) * 1993-08-05 2000-05-23 Kimberly-Clark Worldwide, Inc. Instrument for photoerasable marking
US5616443A (en) * 1993-08-05 1997-04-01 Kimberly-Clark Corporation Substrate having a mutable colored composition thereon
US6211383B1 (en) 1993-08-05 2001-04-03 Kimberly-Clark Worldwide, Inc. Nohr-McDonald elimination reaction
US5645964A (en) * 1993-08-05 1997-07-08 Kimberly-Clark Corporation Digital information recording media and method of using same
US6017471A (en) * 1993-08-05 2000-01-25 Kimberly-Clark Worldwide, Inc. Colorants and colorant modifiers
US5683843A (en) * 1993-08-05 1997-11-04 Kimberly-Clark Corporation Solid colored composition mutable by ultraviolet radiation
US6054256A (en) * 1993-08-05 2000-04-25 Kimberly-Clark Worldwide, Inc. Method and apparatus for indicating ultraviolet light exposure
US5865471A (en) * 1993-08-05 1999-02-02 Kimberly-Clark Worldwide, Inc. Photo-erasable data processing forms
US5700850A (en) * 1993-08-05 1997-12-23 Kimberly-Clark Worldwide Colorant compositions and colorant stabilizers
US5858586A (en) * 1993-08-05 1999-01-12 Kimberly-Clark Corporation Digital information recording media and method of using same
US5721287A (en) * 1993-08-05 1998-02-24 Kimberly-Clark Worldwide, Inc. Method of mutating a colorant by irradiation
US5733693A (en) * 1993-08-05 1998-03-31 Kimberly-Clark Worldwide, Inc. Method for improving the readability of data processing forms
US5643701A (en) * 1993-08-05 1997-07-01 Kimberly-Clark Corporation Electrophotgraphic process utilizing mutable colored composition
US5908495A (en) * 1993-08-05 1999-06-01 Nohr; Ronald Sinclair Ink for ink jet printers
US6060223A (en) * 1993-08-05 2000-05-09 Kimberly-Clark Worldwide, Inc. Plastic article for colored printing and method for printing on a colored plastic article
US6127073A (en) * 1993-08-05 2000-10-03 Kimberly-Clark Worldwide, Inc. Method for concealing information and document for securely communicating concealed information
US6120949A (en) * 1993-08-05 2000-09-19 Kimberly-Clark Worldwide, Inc. Photoerasable paint and method for using photoerasable paint
US5773182A (en) * 1993-08-05 1998-06-30 Kimberly-Clark Worldwide, Inc. Method of light stabilizing a colorant
US6060200A (en) * 1993-08-05 2000-05-09 Kimberly-Clark Worldwide, Inc. Photo-erasable data processing forms and methods
US5643356A (en) * 1993-08-05 1997-07-01 Kimberly-Clark Corporation Ink for ink jet printers
US6342305B1 (en) 1993-09-10 2002-01-29 Kimberly-Clark Corporation Colorants and colorant modifiers
US6071979A (en) * 1994-06-30 2000-06-06 Kimberly-Clark Worldwide, Inc. Photoreactor composition method of generating a reactive species and applications therefor
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BE653387A (xx) 1965-01-18
DE1221559B (de) 1966-07-21
GB991023A (en) 1965-05-05

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