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EP4488073A1 - Document de valeur doté d'un élément de sécurité doté d'un empilement de couches d'interférence et procédé de contrôle - Google Patents

Document de valeur doté d'un élément de sécurité doté d'un empilement de couches d'interférence et procédé de contrôle Download PDF

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Publication number
EP4488073A1
EP4488073A1 EP24179738.0A EP24179738A EP4488073A1 EP 4488073 A1 EP4488073 A1 EP 4488073A1 EP 24179738 A EP24179738 A EP 24179738A EP 4488073 A1 EP4488073 A1 EP 4488073A1
Authority
EP
European Patent Office
Prior art keywords
layer
value document
security element
absorber
authenticity
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.)
Pending
Application number
EP24179738.0A
Other languages
German (de)
English (en)
Inventor
Thomas Happ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP4488073A1 publication Critical patent/EP4488073A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation

Definitions

  • the invention relates to a value document with a value document substrate and a security element applied thereto with an interference layer stack which gives the security element an optically variable appearance when visually observed in reflection.
  • the invention also includes a method for checking such a value document.
  • Data storage media such as valuables or identification documents, but also other valuable items, such as branded goods, are often provided with security elements for security purposes. These allow the authenticity of the data storage media to be verified and at the same time serve as protection against unauthorized reproduction.
  • optically variable security elements are often used, whose special visual effect, for example a color shift effect, can be identified by a viewer with the naked eye without any additional aids.
  • level 1 features are often subject to so-called “harvesting” attacks, in which a counterfeiter removes (“harvests”) the security element from a genuine document and sticks it onto a fake, for example a photocopy, in order to visually enhance it.
  • Foil-based security elements often do not traditionally carry machine-readable features, so that the replacement of such a foil-based security element with a counterfeit cannot be easily detected by machine.
  • a foil-based security element is printed with an IR absorber, for example in non-metallized areas, the absence of the genuine security element on a value document can be detected with IR remission sensors, but a counterfeit with the transferred (genuine) foil is assessed as genuine.
  • the invention is based on the object of specifying a generic value document that avoids the disadvantages of the prior art and in which, in particular, a value document manipulated by a detachment attack can be reliably recognized by machine.
  • the invention is also intended to provide a testing method for value documents secured in this way.
  • the invention includes a value document with a value document substrate and a security element applied to the substrate, wherein the security element contains an interference layer stack which gives the security element an optically variable appearance when visually observed in reflection.
  • the interference layer stack provides a characteristic IR signature as a first authenticity feature of the value document.
  • the value document substrate contains on its surface a background layer containing an IR absorber, which is arranged at least partially beneath the security element.
  • the value document substrate itself may consist of paper, such as in the case of paper banknotes or visas.
  • the value document substrate can be made of a polymer, e.g. polycarbonate or polypropylene, or of a polymer composite.
  • paper-polymer hybrid composite materials such as laminated paper layers can also be used as a value document substrate.
  • the first and second authenticity features together form an authenticity mark that can be checked by machine using infrared technology, and the absence or incompleteness of this indicates that the value document has been manipulated.
  • the absence of the first or second authenticity feature can be used to conclude that the value document has been manipulated.
  • both the donor document with a detached security element and the recipient document with a transferred, genuine security element can be recognized as manipulated.
  • the adhesion of the background layer containing the IR absorber to the substrate is higher than the adhesion to the security element, so that the second authenticity feature remains essentially completely on the value document substrate when the security element is removed.
  • Substantially complete means that more than 90%, more than 94% and in particular more than 98% of the IR absorber remains on the value document substrate.
  • the base layer is preferably formed by a primer layer or a print.
  • the background layer is preferably formed by a paper primer.
  • a paper primer or a suitable print can form a particularly close bond with the value document substrate, so that when the security element is detached, an adhesion break occurs at the interface with the underlying background layer and the security element is removed without the background layer.
  • the background layer is arranged partly below and partly next to the security element. The presence of the IR absorber can then also be detected in areas next to the security element.
  • the background layer is arranged completely beneath the security element.
  • the latter has the advantage that no additional space is required on the valuable document for the additional protection provided by the IR absorber and authenticity can be checked independently of the print design of the valuable document.
  • the interference layer stack is formed by a color-shifting thin-film element.
  • the thin-film element can, for example, have a three-layer structure consisting of an absorber layer, a dielectric spacer layer and a reflector layer, or a five-layer structure consisting of a first absorber layer, a first dielectric spacer layer, a second absorber layer, a second dielectric spacer layer and a reflector layer.
  • Five-layer structures offer the particular advantage of additional degrees of freedom in optical design, as they enable the generation of different IR spectral profiles and thus different IR signatures with a similar or identical visual appearance. allow. An observed visual effect, for example a certain color change when tilting the security element, cannot therefore be used to easily determine the IR signature of the interference layer stack, so that reproducing the effect is very difficult.
  • the reflector layer is preferably opaque and can consist of aluminum, for example.
  • the absorber layer or layers are advantageously formed by semi-transparent chrome layers.
  • the dielectric spacer layers can consist in particular of SiO 2 .
  • the security element advantageously contains a metal layer, which is preferably formed by the reflector layer of the interference layer stack.
  • the metal layer it is also possible for the metal layer to be an additional layer arranged above or below the interference layer stack.
  • the metal layer of the security element is advantageously structured at least in some areas.
  • the metal layer of the security element can have a structured part area with narrow metallic bars, narrow metallic lines and/or metallic patterns and/or characters of low line thickness, the area coverage of the metal layer in the said structured part area preferably being below 20%, in particular below 15% or even below 10%.
  • the narrow metal structures therefore allow greater design freedom for the designer without impairing the technical function of the security element during authenticity testing.
  • the geometric extension of the The area of the structured sub-area is preferably selected such that it has an area of at least 8 mm 2 , preferably at least 20 mm 2 . In this case, the presence of the IR absorber in the subsurface layer can be reliably detected even with inexpensive IR sensors, which may only have a limited spatial resolution in the millimeter range.
  • the IR absorber of the base layer is advantageously essentially transparent or white in the visible spectral range and is therefore visually inconspicuous. While the IR absorber can in principle absorb both spectrally broadly and spectrally narrow-band, IR absorbers that absorb broadly in the near infrared range (NIR) from 700 nm to 1500 nm, in particular in the range from 750 nm to 1100 nm, are currently particularly preferred.
  • NIR near infrared range
  • Suitable IR absorbers can be found, for example, in the publication WO 2007/060133 A1 , the disclosure of which is incorporated into the present application in this respect.
  • suitable IR absorbers are iron(II) or copper(II) compounds with an Fe2+ ion or a Cu2+ ion in a suitable chemical environment, where a suitable chemical environment is, for example, a phosphate ion or a polyphosphate ion or, more generally, a group containing phosphorus and oxygen.
  • a suitable chemical environment is, for example, a phosphate ion or a polyphosphate ion or, more generally, a group containing phosphorus and oxygen.
  • Such IR absorbers absorb over a broad band in the NIR range from 700 nm to 1100 nm, but are essentially transparent or white in the visible spectral range and have at most a slightly yellowish, greenish or bluish tint. The presence of the IR absorber in the background layer is therefore hardly visually
  • IR absorbers are the ones sold under the name LUMOGEN-S by BASF Corporation, 100 Park Ave., Florham Park, NJ 07932.
  • IR substances described in the publication GB 2 168 372 disclosed IR-absorbing materials which are invisible or transparent in the visible range of the electromagnetic spectrum and which are described in the publication US 6,926,764 disclosed IR marking substances. These IR marking substances are substituted naphthalocyanines, phthalocyanines, metal-containing phthalocyanines or poly-substituted phthalocyanines. Thiophenol-substituted copper phthalocyanines, in particular para-toluenethiol-persubstituted copper phthalocyanines, are preferred.
  • the security element contains a relief structure arranged below the interference layer stack.
  • the relief structure can be formed in particular by a micromirror arrangement with directionally reflecting micromirrors, in particular a micromirror arrangement with non-diffractive mirrors.
  • the relief structure can also be formed by a diffractive diffraction structure, in particular a hologram structure, nanostructure or diffractive, blazed grating.
  • the security element can show a movement effect or a three-dimensional appearance in addition to the color shift effect of the interference layer stack and can therefore be visually enhanced and its security against forgery increased.
  • the security element contains a film layer, in particular a film layer that is transparent in the visible spectral range and advantageously also in the near infrared.
  • the security element advantageously covers a continuous opening in the value document substrate with the film layer.
  • the security element can be built up on a transfer film during production, which after the Transfer of the security element to the value document is removed again.
  • Fig. 1 shows a schematic top view of a banknote 10, on whose paper substrate 12 a security element in the form of a partially metallized foil strip 14 is applied.
  • Figure 2 shows a cross-section of banknote 10 in the area of the security element along line II-II of Fig. 1 .
  • the film strip 14 contains a film carrier 16, for example a thin PET film, e.g. 4 ⁇ m - 40 ⁇ m thick, transparent in the visible and near-infrared spectral ranges, which is provided with a color-shifting interference layer stack 20 in a partial area 18.
  • the interference layer stack 20 is formed by a three-layer thin film interference layer system with a reflector layer 22, for example an opaque aluminum layer, a dielectric spacer layer 24, for example a 420 nm thick SiO 2 layer, and an absorber layer, for example an 8 nm thick chromium layer.
  • the interference layer stack 20 When viewed in reflection, the interference layer stack 20 not only has interference maxima in the visually visible spectrum from 380 nm to 780 nm, but also shows interference maxima in the near infrared between 780 nm and 3000 nm. These NIR interference maxima are intrinsically linked to the layer structure responsible for the visual color shift effect of the interference layer stack 20, in particular the specific thickness of the dielectric spacer layer 24, and are equally present for all security elements with this layer structure, so that the interference layer stack 20 provides a characteristic IR signature as a first authenticity feature.
  • a base layer 30 is applied to the paper substrate 12 under and partly also next to the film strip 14, which is mixed with an IR absorber 32 and which can be in the form of a paper primer or a print.
  • the base layer 30 has a high level of adhesion to the paper substrate 12, in particular the adhesion of the base layer 30 to the paper substrate 12 is higher than to the film strip 14.
  • the IR absorber 32 is ideally transparent in the visible spectral range and has at most a slight tint.
  • the presence of the background layer 30 is therefore visually inconspicuous, so that the position and extent of the background layer 30 in Fig. 1 are only indicated with dashed lines.
  • the background layer 30 offset with the IR absorber 32 forms a second authenticity feature of the banknote 10, and the first and second authenticity features together form an authenticity mark of the value document that can be checked by machine using infrared radiation.
  • the complete presence and correct position of the two authenticity features can serve as proof of the authenticity of the banknote 10, while the absence of one of the two authenticity features or a deviating position or extent of one of the authenticity features indicates that the banknote 10 has been manipulated.
  • FIG. 3 in (a) a section of the unmanipulated banknote 10 with four measuring tracks 40, 42, 44, 46, in which the IR remission of the banknote 10 is measured spectrally resolved by an IR sensor during the authenticity check.
  • a measurement of the IR remission at several different wavelengths allows the characteristic IR signature of the interference layer stack 20 from the IR signature of other interference layer stacks with different layer structures and in particular from the IR remission of IR absorber materials.
  • Figure 3(b) shows schematically the measurement result on banknote 10 in the four measuring tracks of the Fig. 3(a)
  • the measuring tracks 40 and 46 lie outside the partial area 18 provided with the interference layer stack in an infrared-transparent area of the carrier film 16. In these measuring tracks, the sensor therefore detects the IR remission 50 of the IR absorber 32 of the background layer 30 both below and next to the film strip 14.
  • the measuring tracks 42, 44 also cover the partial area 18 with the interference layer stack 20.
  • the sensor measures the IR remission 50 of the IR absorber 32 of the background layer 30.
  • the sensor only detects the characteristic IR signature 52 of the interference layer stack 20, while the IR absorber 32 located below the film strip 14 is shielded by the metallic reflection layer 22 of the interference layer stack 20 and does not contribute to the IR signal.
  • the positions and sizes of the areas with recorded IR remission 50 or IR signature 52 in the four measuring tracks 40-46 are then compared with expected positions and sizes and the banknote is assessed as genuine if they match.
  • the IR signature generated by the layer sequence of the interference layer stack 20 and thus the first authenticity feature is inevitably removed from the banknote 10.
  • the background layer 30 with the IR absorber 32 remains essentially completely on the paper substrate 12 of the donor banknote due to its high adhesion to the paper substrate 12 even when the film strip 14 is removed.
  • FIG. 4 now shows in (a) a section of a manipulated banknote 10-V1, in which the foil strip 14 detached from the genuine banknote 10 was transferred to an unauthorized substrate 12-V, for example a photocopy.
  • the background layer remaining on the original paper substrate 12 was not transferred during the removal attack and is therefore not present on the substrate 12-V.
  • Figure 4(b) shows schematically the measurement result on the manipulated banknote 10-V1 during the authenticity test in the four measuring tracks of the Fig. 3
  • the measuring tracks 40, 46 which lie outside the partial area 18, no IR signal is detected due to the absence of the background layer 30 and the IR absorber 32.
  • the characteristic IR signature 52 of the transferred interference layer stack 20 is recorded, but the IR remissions of the IR absorber to the right and left of the interference stack 20 are missing in these measuring tracks.
  • Figure 5 shows in (a) a section of another manipulated banknote 10-V2, in which the paper substrate 12 of the donor banknote was provided with a counterfeit foil strip 14-V in the area of the background layer 30 after the original foil strip 14 had been removed.
  • Figure 5(b) shows schematically the measurement result on the manipulated banknote 10-V2 during the authenticity test in the four measuring tracks of the Fig. 3 .
  • the sensor measures the IR remission 50 of the IR absorber 32 of the background layer 30 is recorded both below and next to the foil strip 14-V. Since the banknote 10-V2 contains the original paper substrate 12, the measured IR remission 50 corresponds to the expected remission.
  • the IR signature 54 of the counterfeit film strip 14-V is recorded instead of the expected IR signature 52.
  • the determined position of the partial area 18, in particular relative to the position of the background layer 30, deviates from the expected position.
  • Fig. 6 schematically a banknote 10 with a background layer 30 provided with an IR absorber 32 and a film strip 80 arranged on the background layer 30 in cross section
  • Fig. 7 shows in (a) a section of a banknote 10 with such a foil strip 80 in plan view and in (b) the spatially resolved, corresponding IR signal measured by an IR sensor.
  • the background layer 30 is located exclusively under, but not next to, the foil strip 80. This has the advantage that no additional space is required on the banknote 10 for the combined protection provided by the first and second authenticity features, and that the authenticity of the banknote can be checked locally in the area of the foil strip 80, regardless of the print design of the banknote.
  • foil strip 80 in the design of the Fig. 6 provided with a more complex interference layer stack 60, namely with a 5-layer thin film interference layer system, which has an opaque aluminum layer as reflector layer 62, a 280 nm thick dielectric SiO 2 layer as second dielectric spacer layer 64, a 3 nm thick chromium layer as second absorber layer 66, a 140 nm thick dielectric SiO 2 layer as first dielectric spacer layer 68 and a 5 nm thick chromium layer as first absorber layer 70.
  • a 5-layer thin film interference layer system which has an opaque aluminum layer as reflector layer 62, a 280 nm thick dielectric SiO 2 layer as second dielectric spacer layer 64, a 3 nm thick chromium layer as second absorber layer 66, a 140 nm thick dielectric SiO 2 layer as first dielectric spacer layer 68 and a 5 nm thick chromium layer as first absorber layer 70.
  • Such 5-layer systems allow additional degrees of freedom
  • the aluminum layer 62 of the interference layer stack 60 is only present in the form of narrow metal webs 84 in a first partial area 82 of the film strip 80, so that the partial area 82 is largely transparent.
  • the film strip is essentially opaque, the aluminum layer 62 is present over the entire surface except for narrow recesses 88.
  • the surface coverage of the metallization in the partial area 86 is above 80%, preferably above 90%.
  • Fig. 7 shows an example design in (a) in which the narrow metal bars 84 in the partial area 82 form a regular square grid and in two places the value number "10" executed with a narrow line width.
  • the recesses 88 form a geometric shape or pattern.
  • the area coverage of the metallization is below 20% in the partial area 82, but above 80% in the partial area 86.
  • the IR detection is not impaired by the metallic webs 84 or the narrow recesses 88. Rather, the sensor continuously detects the IR remission 50 of the IR absorber 32 in the partial area 82 and the IR signature 56 of the interference layer stack 60 in the partial area 86.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
EP24179738.0A 2023-07-06 2024-06-04 Document de valeur doté d'un élément de sécurité doté d'un empilement de couches d'interférence et procédé de contrôle Pending EP4488073A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102023117912.8A DE102023117912A1 (de) 2023-07-06 2023-07-06 Wertdokument mit Sicherheitselement mit Interferenzschichtstapel und Prüfverfahren

Publications (1)

Publication Number Publication Date
EP4488073A1 true EP4488073A1 (fr) 2025-01-08

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Family Applications (1)

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EP24179738.0A Pending EP4488073A1 (fr) 2023-07-06 2024-06-04 Document de valeur doté d'un élément de sécurité doté d'un empilement de couches d'interférence et procédé de contrôle

Country Status (3)

Country Link
EP (1) EP4488073A1 (fr)
CN (1) CN119261424A (fr)
DE (1) DE102023117912A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168372A (en) 1984-12-13 1986-06-18 Secr Defence Alkoxyphthalocyanines
US6926764B2 (en) 2001-10-31 2005-08-09 Sicpa Holding S.A. Ink set, printed article, a method of printing and use of a colorant
WO2007060133A1 (fr) 2005-11-25 2007-05-31 Sicpa Holding S.A. Encre pour intaglio absorbant l'ir
EP3967508A1 (fr) * 2020-09-09 2022-03-16 Giesecke+Devrient Currency Technology GmbH Élément de sécurité optiquement variable
WO2023285000A1 (fr) 2021-07-16 2023-01-19 Giesecke+Devrient Currency Technology Gmbh Billet de banque comportant un substrat de billet de banque et un élément de sécurité, et procédé de vérification d'un billet de banque

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416191A1 (de) * 1994-05-06 1995-11-09 Consortium Elektrochem Ind Interferenzpigmente aus in cholesterischer Anordnung fixierten Molekülen sowie deren Verwendung
DE19738368A1 (de) * 1997-09-02 1999-03-04 Basf Ag Mehrschichtige cholesterische Pigmente
EP1529653A1 (fr) * 2003-11-07 2005-05-11 Sicpa Holding S.A. Document de sécurité, méthode de production d'un document de sécurité et l'utilisation d'un document de sécurité
DE102005017169B4 (de) * 2005-04-13 2023-06-22 Ovd Kinegram Ag Transferfolie
DE102016013242A1 (de) * 2016-11-07 2018-05-09 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit optisch variablem Durchsichtselement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168372A (en) 1984-12-13 1986-06-18 Secr Defence Alkoxyphthalocyanines
US6926764B2 (en) 2001-10-31 2005-08-09 Sicpa Holding S.A. Ink set, printed article, a method of printing and use of a colorant
WO2007060133A1 (fr) 2005-11-25 2007-05-31 Sicpa Holding S.A. Encre pour intaglio absorbant l'ir
EP3967508A1 (fr) * 2020-09-09 2022-03-16 Giesecke+Devrient Currency Technology GmbH Élément de sécurité optiquement variable
WO2023285000A1 (fr) 2021-07-16 2023-01-19 Giesecke+Devrient Currency Technology Gmbh Billet de banque comportant un substrat de billet de banque et un élément de sécurité, et procédé de vérification d'un billet de banque

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CN119261424A (zh) 2025-01-07
DE102023117912A1 (de) 2025-01-09

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