US3886083A - Safety inks and documents - Google Patents
Safety inks and documents Download PDFInfo
- Publication number
- US3886083A US3886083A US468409A US46840974A US3886083A US 3886083 A US3886083 A US 3886083A US 468409 A US468409 A US 468409A US 46840974 A US46840974 A US 46840974A US 3886083 A US3886083 A US 3886083A
- Authority
- US
- United States
- Prior art keywords
- water
- soluble
- dye
- lower alcohols
- color
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/50—Sympathetic, colour changing or similar inks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
- B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/916—Fraud or tamper detecting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
Definitions
- ABSTRACT This safety ink is useful for printing a background of fine lines or dots on a document of value, such as a bank check.
- the background extends over an area which is adapted to be written upon. If the area in question is written upon and an attempt is thereafter made to eradicate the writing, the background changes color, thereby making it obvious upon visual inspection that an attempt has been made to alter the writing.
- the ink includes a dye which is soluble and bleachable and a fluorescent pigment whose fluorescence is enhanced if the attempted alteration is by means of a dissolving or bleaching technique, so that removal of part of the dye results in a change in color and also in an enhancement of the fluorescent intensity of the remaining printed matter. If an attempt is made to alter the writing by erasure, rather than eradication, some of the fluorescent pigment is removed, and its fluorescent intensity is consequently decreased. Hence, an attempted alteration is detectable either under ordinary light by the change in visible color or under ultraviolet light by the change in the fluorescent intensity.
- Guertin US. Pat. No. 3,088,841 discloses a printed document having adjacent background areas printed in different inks of the same color.
- One of the inks is bleachable and soluble in water and insoluble in the lower alcohols and lower ketones.
- the other ink is soluble only in the lower alcohols and lower ketones and is insoluble in water and unbleachable.
- the two areas react differently to alteration attempts involving. either bleaching or solution in water or in the ,lower alcohols and lower ketones.
- any such alteration attempt produces a color contrast between the two areas, which makes the attempted alteration readily'detectable visually.
- Guertin U.S. Pat. No. 3,400,003 shows a document which is printed with two superimposed background patterns, of different colors, each composed of fine lines or dots.
- One of the patterns is printed in ink whose coloring matter contains a component which is bleachable, and soluble in water and in the lower alcohols and ketones.
- the other pattern is printed in an ink which is nonbleachable and not soluble in water and the lower alcohols and lower ketones.
- the background which may be either an even color or an array of elements such as lines or dots, is printed in an ink whose coloring matter includes a dye which is bleachable and soluble in water and the lower alcohols and ketones, and a fluorescent pigment which is not bleachable, insoluble in water, and no more than very slightly soluble in the lower alcohols and ketones, but which is at least partly removed by an attempted erasure.
- a document in accordance with the present invention may include two sets of background elements printed in adjacent areas in the same color.
- the document may include two superimposed sets of background elements printed in different colors.
- the present invention does not require more than a single set of background elements, or a single even background color, printed in a single ink.
- This invention relates to safety papers, ie., printed documents, such as negotiable instruments, which are adapted for the insertion of'names, amounts, etc., either by hand, by typewriter or other mechanical devices and which are sensitive to attempts to alter inserted names, amounts, etc.
- the invention includes bothinks designed to give the required sensitivity and having the characteristics necessary for such documents, and the documents printed with such inks.
- sensitivity to attempted alteration is meant that an attempt to alter the printed document results in an observable change in the appearance of the document so as to alert a person receiving it to the fact that the document has been altered.
- Documents of value are most commonly written upon in ink.
- the inks which are commonly used to write on documents of value may be classified either as conventional inks, ball point pen inks, or transfer sheet inks.
- Conventional inks are water solutions of either a dye, typically an aniline dye, or a ferrous salts which oxidizes to a ferric salt after'writing, or combinations of both a salt and a dye.
- a ball point pen ink is typically relatively stiff and heavy and may consist of one of the higher glycols as a vehicle, with an aniline dye for coloring material. Many of the ball point pen inks cannot be eradicated either by the use of water as a solvent or by the bleaching method.
- Line eradication involves the application of eradicating solution only to the particular line or lines to be eradicated.
- sheet eradication the entire sheet or document is immersed in the solvent or other agent used.
- the line eradication technique is the one most frequently employed in connection with conventional inks. It has been determined that the ball point pen inks require, in all the known processes, the sheet eradication technique.
- Transfer sheet ink is used herein as a generic term to describe the materials employed on transfer sheets to produce a mark on an underlying sheet when the overlying sheet is written or typewritten upon.
- the term transfer sheet includes typewriter ribbons, carbon paper, carbonless carbon paper and any other sheet, usually employing a coated under surface, which is sensitive to localized pressure on the top of the overlying sheet to make a mark on the underlying sheet.
- the term transfer sheet ink is intended to include those materials which are latent in that there is no observable color on the sheet or on the underlying sheet until after the writing is applied.
- Transfer sheet inks may be described as either solvent types, in which the coloring matter is dissolved in material analogous to those used in the ball point pen inks, or wax types, in which the coloring material is carried by a wax vehicle, whether in solution or by simply mixing it with the wax vehicle.
- Transfer sheet inks and the techniques for eradicating them are of many different types. Some such inks are water soluble. Some are soluble in the lower alco lhols or in the lower ketones or both. Some are bleachable. Some can be removed only by mechanical erasure.
- the inks of the present invention produce an observable indication that an attempt has been made to alter written material on a document, whether that attempt was made by a solution technique, by bleaching, or by mechanical erasure Safety papers prepared in accordance with the invention have printed matter thereon, which is changed in color and in its fluorescent intensity by the techniques presently known for eradicating ball point pen ink.
- the printed matter so changed consists of a background ofclosely spaced fine lines, which may appear in any suitable configuration of characters, words, geometric figures, etc.
- the ink in which at least some of the printed patterns of the background appear should be soluble in organic solvent selected from the class having not more than 8 carbon atoms and consisting of the lower alcohols and lower ketones.
- the two inks must be compatible if a single impression printing process is to be employed. At least one of the inks must include a coloring matter component soluble in the lower alcohols and lower ketones, and a fluorescent pigment which is insoluble in water and has only a very low solubility in the lower ketones and lower alcohols.
- the ink components may or may not be soluble in water, as desired. Typically, it is desired that the ink components which are soluble in the lower alcohols and lower ketones be also soluble in water. However, in some cases, printed documents may be exposed for long periods of time to the air in humid climates. In those cases, it is essential that the ink components employed should not be so water soluble that high humidity will make it start to run and destroy the pattern.
- the vehicle is the one described in U.S. Pat. No. 3,400,003, which is suitable from the standpoint of being miscible with the various coloring matters employed in inks manufactured according to the invention and which is also soluble in water and in the lower alcohols and ketones.
- This vehicle consists essentially of about 20% glycerine. about 64% sorbitol and about l6% water. These percentages are by weight.
- the proportion of glycerine employed in this vehicle may vary from about 10% to about 30%. If the proportion of glycerine is reduced below about 10%, tendencies to crystallize are observed. If the proportion of glycerine is increased above about 30%, the consistency of the vehicle becomes too thin for proper operation on conventional printing presses.
- the relative proportions of sorbitol and water should remain about the same (i.e. about by weight of the material other than glycerine should be sorbitol and about 20% water).
- Printing inks containing this vehicle perform satisfactorily on the printing press and are stable during printing and after being applied to the paper by the printing press.
- the resulting printed lines support writing by all the usual writing media without noticeable bleed and feather of the written line. Additionally, the resulting printed material is stable to handling during use and does not tend to change in color and effectively responds in the intended to fraudulent manipulation of the written material to create a noticeable change in the appearance of the document.
- COLORING MATTER It is therefore now proposed to use a fluorescent pigment in the ink, in such a manner that a document which has been subject to an attempted alteration will show a change in intensity of the fluorescence, in addition to the change in color under normal light.
- the change may be either an increase or decrease in fluorescent intensity in those areas where the alteration technique has been applied.
- the generally even tone of the pattern of background elements will be interrupted, in each location where an alteration has been attempted, by either intensified fluorescence or lessened fluorescence, depending upon the particular type of alteration technique which has been employed.
- the pigment selected should be non-bleachable, insoluble in water, and no more than very slightly soluble in the lower alcohols and lower ketones.
- a substance is defined as very slightly soluble by Hackhs Chemical Dictionary, if it requires from 1,000 to 10,000 parts of solvent to dissolve one part of the substance.
- a substance is defined by the same authority as insoluble if it requires more than 10,000 parts of solvent to dissolve one part of the substance.
- the areas which were subjected to the eradicating solution will present a contrast to the other areas of the background.
- This contrast will be observable in visible light as a color contrast and will also be observable in ultraviolet light as a contrast between two areas of different fluorescent intensity, i.e., the eradicated areas will be brighter than the areas where no eradicating solution has been used.
- Ultraviolet viewers are in common use by bank tellers, cashiers, and the like, so that a person accepting such a document can readily make a check of its validity by placing it under an ultraviolet light. This test can confirm a suspicion that a particular document has been altered, in those instances where a visual inspection gives only borderline results. Furthermore, it can detect some alterations which are not observable by a visual test.
- the ink may consist essentially of the vehicle described above and coloring matter including a fluorescent pigment such as Resoform Fluorescent Yellow (Pigment Yellow No. 101, CI. No. 48052, GAF Corp.) which may be 70.6 by weight of the coloring matter and a mixture of dyes including:
- a fluorescent pigment such as Resoform Fluorescent Yellow (Pigment Yellow No. 101, CI. No. 48052, GAF Corp.) which may be 70.6 by weight of the coloring matter and a mixture of dyes including:
- Acid Blue C.l. No. 42755 Croceine Acid Red, E.l. No. 27290, Tartrazine C Acid Yellow No. 23, Cl. No. 19140 Fuschine S.B.P. Basic Violet No. 14, CI. No. 42510 6 published by Society of Dyeists and Colourists, PO. Box 244, 82 Grattan Road, Bradford, England.
- the particular pigment described above is not bleachable and is insoluble in water and in the lower alcohols and ketones.
- a printing ink consisting essentially of coloring matter and a vehicle soluble in water and lower alcohols and lower ketones, said vehicle consisting essentially of glycerine, sorbitol and water, the glycerine being present in an amount in the range 10-30% by weight based on said vehicle, the remaining percentages of sorbitol and water having a weight ratio of about 4: 1 said coloring matter including a dye soluble in lower alcohols and lower ketones wherein said lower alcohols and said lower ketones contain not more than 8 carbon atoms per molecule, and a fluorescent pigment which is non-bleachable, insoluble in water and no more than very slightly soluble in said lower alcohols and lower ketones.
- a printed document comprising:
- said area having a background of printed elements including a pattern printed in an ink consisting essentially of coloring matter and a vehicle soluble in water and lower alcohols and lower ketones;
- said vehicle consisting essentially of glycerine, sorbitol, and water, the glycerine being present in an amount in the range 10-30% by weight based on said vehicle, the remaining percentages of sorbitol and water having a weight ratio of about 4:1;
- said color matter including:
- a dye soluble in lower alcohols and lower ketones wherein said lower alcohols and said lower ketones contain not more than eight carbon atoms per molecule, said dye being bleachable and soluble in water, said dye being at least partly removed by solution or bleaching, and thereby changing the color of the background in response to attempted alteration of written material by solution or bleaching techniques;
- a fluorescent pigment which is nonbleachable, insoluble in water, and no more than very slightly soluble in said lower alcohols and lower ketones, said pigment having its ,fluorescence enhanced by removal of the dye during solution or bleaching, and being at least partly removedby erasure, thereby changing the color and flourescent intensity of the background, when viewed under ultraviolet light, in response to attempted alteration of written material by erasure.
Abstract
Description
Claims (4)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US468409A US3886083A (en) | 1974-05-09 | 1974-05-09 | Safety inks and documents |
GB118975A GB1455678A (en) | 1974-05-09 | 1975-01-10 | Safety inks and documents |
CA218,520A CA1039456A (en) | 1974-05-09 | 1975-01-23 | Safety inks and documents |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US468409A US3886083A (en) | 1974-05-09 | 1974-05-09 | Safety inks and documents |
Publications (1)
Publication Number | Publication Date |
---|---|
US3886083A true US3886083A (en) | 1975-05-27 |
Family
ID=23859700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US468409A Expired - Lifetime US3886083A (en) | 1974-05-09 | 1974-05-09 | Safety inks and documents |
Country Status (3)
Country | Link |
---|---|
US (1) | US3886083A (en) |
CA (1) | CA1039456A (en) |
GB (1) | GB1455678A (en) |
Cited By (66)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4136229A (en) * | 1976-05-25 | 1979-01-23 | Societe Anonyme Dite: Arjomari-Prioux | Security paper |
US4183989A (en) * | 1976-12-07 | 1980-01-15 | Portals Limited | Security papers |
DE2834459A1 (en) * | 1978-08-05 | 1980-03-06 | Staedtler Fa J S | Reducible ink for marking or coating daylight projection film - contains water, glycol, reducible dyestuff and wetting agent |
US4411946A (en) * | 1981-01-08 | 1983-10-25 | Bayer Aktiengesellschaft | Impregnating paper with 7-hydroxy-coumarin compounds |
US4627642A (en) * | 1984-09-07 | 1986-12-09 | Sotimag (Sarl) | Method of marking for deterring fraud with valuable documents |
US4884828A (en) * | 1987-02-18 | 1989-12-05 | Cmb Packaging (Uk) Limited | Security documents |
US4936607A (en) * | 1988-01-27 | 1990-06-26 | Moore Business Forms, Inc. | Security for images formed by impact based systems |
US5033773A (en) * | 1988-01-27 | 1991-07-23 | Moore Business Forms | Security for images formed by impact based systems |
US5058925A (en) * | 1989-12-13 | 1991-10-22 | The Standard Register Company | Leach resistant ink for protecting documents from alteration and document protected thereby |
US5064221A (en) * | 1989-03-02 | 1991-11-12 | Francotyp-Postalia Gmbh | Method for distinguishing printed originals from copies |
US5135569A (en) * | 1990-08-24 | 1992-08-04 | W. R. Grace & Co.-Conn. | Ink composition containing fluorescent component and method of tagging articles therewith |
US5232494A (en) * | 1992-07-31 | 1993-08-03 | Binney & Smith Inc. | Color changing compositions |
WO1994006872A1 (en) * | 1992-09-18 | 1994-03-31 | The Gillette Company | Assembly or set of different color inks and an assembly of writing instruments |
WO1994016902A1 (en) * | 1993-01-22 | 1994-08-04 | Butland Trust Organization | Technique for labeling an object for its identification and/or verification |
US5352282A (en) * | 1992-07-31 | 1994-10-04 | Binney & Smith, Inc. | Color changing compositions |
US5362167A (en) * | 1991-12-18 | 1994-11-08 | The Gillette Company | Fiber marker including an erasable ink |
US5378752A (en) * | 1992-11-05 | 1995-01-03 | The Gillette Company | Ink eradicator system including film forming polymer |
US5421869A (en) * | 1993-05-28 | 1995-06-06 | Nocopi Technologies, Inc. | Security marking method and composition |
US5460647A (en) * | 1995-02-10 | 1995-10-24 | Binney & Smith Inc. | Color-changing marking composition system |
US5464470A (en) * | 1995-02-10 | 1995-11-07 | Binney & Smith Inc. | Color-changing marking composition system |
US5478382A (en) * | 1992-07-31 | 1995-12-26 | Binney & Smith Inc. | Color changing compositions for use on non-porous surfaces |
US5486228A (en) * | 1992-07-31 | 1996-01-23 | Binney & Smith Inc. | Washable color changing compositions |
US5489331A (en) * | 1992-07-31 | 1996-02-06 | Binney & Smith Inc. | Color changing compositions using acids |
US5492558A (en) * | 1992-07-31 | 1996-02-20 | Binney & Smith Inc. | Color changing compositions for highlighters |
US5498282A (en) * | 1992-07-31 | 1996-03-12 | Binney & Smith Inc. | Color changing pan paint compositions |
WO1996009590A1 (en) * | 1994-09-20 | 1996-03-28 | Nevin William W | System and method for generating and printing printouts and for detecting and preventing alteration of bank instrument |
US5503665A (en) * | 1992-07-31 | 1996-04-02 | Binney & Smith Inc. | Latent image compositions |
US5510199A (en) * | 1994-06-06 | 1996-04-23 | Clarke American Checks, Inc. | Photocopy resistant document and method of making same |
US5516362A (en) * | 1993-05-28 | 1996-05-14 | Nocopi Technologies, Inc. | Security marking method and composition |
US5516590A (en) * | 1993-07-15 | 1996-05-14 | Ncr Corporation | Fluorescent security thermal transfer printing ribbons |
US5599578A (en) * | 1986-04-30 | 1997-02-04 | Butland; Charles L. | Technique for labeling an object for its identification and/or verification |
US5599853A (en) * | 1993-01-29 | 1997-02-04 | The Gillette Company | Erasable inks |
US5649999A (en) * | 1996-02-22 | 1997-07-22 | The Gillette Company | Ink eradicator system |
US5766324A (en) * | 1994-12-28 | 1998-06-16 | Hitachi Maxell, Ltd. | Ink composition, printed matter, and thermal transfer recording medium |
US5789019A (en) * | 1994-07-21 | 1998-08-04 | Alagao Aktiengesellschaft | Method for protecting against forgery sheet-like printed documents |
WO1998034990A1 (en) * | 1997-02-10 | 1998-08-13 | Jong Yol Kim | Interior wallpaper printing composition and manufacturing method thereof |
US5807224A (en) * | 1984-05-22 | 1998-09-15 | Southpac Trust International, Inc. | Sheets and sheet rolls of wrapping material having information selectable by choice blocks |
US5916357A (en) * | 1997-03-25 | 1999-06-29 | The Gillette Company | Eradicable inks |
WO1999034984A1 (en) * | 1998-01-07 | 1999-07-15 | Dna Technologies, Inc. | Labeling technique for countering product diversion and product counterfeiting |
US5944881A (en) * | 1997-07-25 | 1999-08-31 | The Standard Register Company | Tri-component security numbering ink |
US6149721A (en) * | 1999-02-03 | 2000-11-21 | The Gillette Company | Solvent-based pen inks |
US6159585A (en) * | 1997-03-14 | 2000-12-12 | Georgia-Pacific Corporation | Security paper |
CN1060494C (en) * | 1997-05-22 | 2001-01-10 | 石家庄印钞厂 | Anti-altering printing ink |
US6232124B1 (en) | 1996-05-06 | 2001-05-15 | Verification Technologies, Inc. | Automated fingerprint methods and chemistry for product authentication and monitoring |
US6490030B1 (en) | 1999-01-18 | 2002-12-03 | Verification Technologies, Inc. | Portable product authentication device |
US6512580B1 (en) | 1999-10-27 | 2003-01-28 | Verification Technologies, Inc. | Method and apparatus for portable product authentication |
US20030112423A1 (en) * | 2000-04-24 | 2003-06-19 | Rakesh Vig | On-line verification of an authentication mark applied to products or product packaging |
US6589626B2 (en) | 2000-06-30 | 2003-07-08 | Verification Technologies, Inc. | Copy-protected optical media and method of manufacture thereof |
US6638593B2 (en) | 2000-06-30 | 2003-10-28 | Verification Technologies, Inc. | Copy-protected optical media and method of manufacture thereof |
US20040000787A1 (en) * | 2000-04-24 | 2004-01-01 | Rakesh Vig | Authentication mark for a product or product package |
US20040023397A1 (en) * | 2002-08-05 | 2004-02-05 | Rakesh Vig | Tamper-resistant authentication mark for use in product or product packaging authentication |
US6786954B1 (en) * | 1999-06-10 | 2004-09-07 | The Board Of Trustees Of The Leland Stanford Junior University | Document security method utilizing microdrop combinatorics, ink set and ink composition used therein, and product formed |
WO2005035673A1 (en) * | 2003-10-07 | 2005-04-21 | Sanford L.P. | Highlightable inks comprising eradicable dyes, marking instruments, and methods of using the same |
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US20050158471A1 (en) * | 2003-10-07 | 2005-07-21 | Leighton Davies-Smith | Method of highlighting with a reversible highlighting mixture, highlighting kit, and highlighted complex |
US6936334B2 (en) * | 2002-06-07 | 2005-08-30 | Eastman Kodak Company | Steganographically encoded media object having an invisible colorant |
US20060066465A1 (en) * | 2004-09-25 | 2006-03-30 | Gotthilf Koerner | Circuit configuration for analog/digital conversion |
US7079230B1 (en) | 1999-07-16 | 2006-07-18 | Sun Chemical B.V. | Portable authentication device and method of authenticating products or product packaging |
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US7124944B2 (en) | 2000-06-30 | 2006-10-24 | Verification Technologies, Inc. | Product packaging including digital data |
US20070001011A1 (en) * | 2000-06-30 | 2007-01-04 | Verification Technologies, Inc. | Product packaging including digital data |
US20070017413A1 (en) * | 2003-10-07 | 2007-01-25 | Sanford, L.P. | Highlighting marking compositions, highlighting kits, and highlighted complexes |
US7241399B2 (en) | 2000-09-08 | 2007-07-10 | Centrum Fuer Angewandte Nanotechnologie (Can) Gmbh | Synthesis of nanoparticles |
US7486790B1 (en) | 2000-06-30 | 2009-02-03 | Verification Technologies, Inc. | Method and apparatus for controlling access to storage media |
US20090311415A1 (en) * | 2005-03-04 | 2009-12-17 | Andre Josten | Marker Solution to be Applied by Means of an Inkjet Printer |
WO2014176686A1 (en) * | 2013-05-02 | 2014-11-06 | Delphax Technologies Inc. | Use of flourescent inks for document authentication |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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GB9408342D0 (en) * | 1994-04-27 | 1994-06-15 | Willett Int Ltd | Method and composition |
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US3400003A (en) * | 1963-04-02 | 1968-09-03 | American Bank Note Co | Safety inks and documents |
US3489703A (en) * | 1966-09-02 | 1970-01-13 | Magnaflux Corp | Quick-drying marking paint |
US3561990A (en) * | 1966-06-14 | 1971-02-09 | Koppers Co Inc | Fluorescent ink and method for making materials fluoresce |
US3741907A (en) * | 1970-03-20 | 1973-06-26 | Giegle G & Co Gmbh | Fluorescent pigments having an isocyanate resin base |
US3804774A (en) * | 1972-08-03 | 1974-04-16 | Horizons Inc | Inks which fluoresce when exposed to near or middle ultraviolet radiation |
-
1974
- 1974-05-09 US US468409A patent/US3886083A/en not_active Expired - Lifetime
-
1975
- 1975-01-10 GB GB118975A patent/GB1455678A/en not_active Expired
- 1975-01-23 CA CA218,520A patent/CA1039456A/en not_active Expired
Patent Citations (12)
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US3741907A (en) * | 1970-03-20 | 1973-06-26 | Giegle G & Co Gmbh | Fluorescent pigments having an isocyanate resin base |
US3804774A (en) * | 1972-08-03 | 1974-04-16 | Horizons Inc | Inks which fluoresce when exposed to near or middle ultraviolet radiation |
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US4411946A (en) * | 1981-01-08 | 1983-10-25 | Bayer Aktiengesellschaft | Impregnating paper with 7-hydroxy-coumarin compounds |
US5934044A (en) * | 1984-05-22 | 1999-08-10 | Southpac Trust International, Inc. | Method of forming a flower pot or flower pot cover having a label incorporated therein |
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US5135569A (en) * | 1990-08-24 | 1992-08-04 | W. R. Grace & Co.-Conn. | Ink composition containing fluorescent component and method of tagging articles therewith |
US5362167A (en) * | 1991-12-18 | 1994-11-08 | The Gillette Company | Fiber marker including an erasable ink |
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Also Published As
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CA1039456A (en) | 1978-10-03 |
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