EP0530059B1 - System for the reversibel authentification of a security paper - Google Patents

System for the reversibel authentification of a security paper Download PDF

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Publication number
EP0530059B1
EP0530059B1 EP92401979A EP92401979A EP0530059B1 EP 0530059 B1 EP0530059 B1 EP 0530059B1 EP 92401979 A EP92401979 A EP 92401979A EP 92401979 A EP92401979 A EP 92401979A EP 0530059 B1 EP0530059 B1 EP 0530059B1
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EP
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Prior art keywords
composition
paper
obliterating
fact
coloured
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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
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EP92401979A
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German (de)
French (fr)
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EP0530059A1 (en
Inventor
Sandrine Dubois
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ArjoWiggins SAS
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ArjoWiggins SAS
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Classifications

    • 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
    • B41M3/142—Security printing using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/46—Elements suited for chemical verification or impeding chemical tampering, e.g. by use of eradicators

Definitions

  • the present invention relates to a security paper which can be authenticated using means forming a colored trace on the paper, this trace being erasable.
  • Various security papers are known which can be authenticated using authentication compositions. Such papers are described, for example, in European patent application EP-A-391,542, filed by WIGGINS TEAPE.
  • a security paper authentication system is described which comprises, in combination, a security paper comprising both a starch and an iodate salt and an authentication composition consisting of an acidic solution. an iodide, the system being such that when the authentication composition is applied to the authentic security paper, the iodine is generated and a characteristic amidoniode color is produced.
  • German patent DE-C-856 842 has also described a paper which contains a pH indicator, this indicator coloring differently when the paper is moistened with water having a certain pH.
  • the paper thus obtained has the initial coloring of the pH indicator. For example, if bromophenol blue is used as an indicator, the paper is yellow. If you humidify, a blue trace forms.
  • German patent DE-C-397 363 describes a process for manufacturing a security paper such as sulfur dyes, copper dyes which are introduced into the paper by treatment with alkaline agents. or reducing, a color which under the action of air disappears again, so that the initial dye is regenerated.
  • an authentication system which includes a security paper on which marks or traces can be produced using an authentication composition, the marks being erasable by a second composition.
  • An object of the invention is therefore to be able to carry out an authentication of a security paper, this authentication being non-destructive.
  • Another object of the invention is to be able to quickly check a security paper and without harming the initial appearance of the paper.
  • Another object of the invention is to obtain a reversibly authenticated security paper, this paper having a white color.
  • the paper comprises the ions of the transition metals and that the authentication composition comprises the complexing agent of these ions.
  • the complexing agent is the thiocyanate ion, used in the form of salts chosen in particular from its potassium or ammonium or sodium salts;
  • the transition metal ions are more preferably ions of copper or cobalt, in particular copper II or cobalt II, used in the form of salts such as copper chloride or sulfate, for example;
  • the erasing composition comprises a reducing agent such as sulfite or bisulfite ions.
  • the paper comprises a potassium thiocyanate
  • the authentication composition comprises a copper chloride
  • the erasing composition comprises sodium sulfite
  • the paper may contain copper chloride and the authentication composition may contain thiocyanate.
  • the complexing agent is the thiocyanate ion, used in the form of salts chosen in particular from its potassium or ammonium or sodium salts;
  • the ions transition metals are iron ions, in particular iron III, used in the form of its salts such as ferric chloride;
  • the erasing composition comprises fluoride ions.
  • the paper comprises a potassium thiocyanate
  • the authentication composition comprises ferric chloride at a pH less than or equal to 3
  • the erasure composition comprises sodium fluoride
  • the paper to be authenticated is based on cellulose fibers and / or synthetic fibers. It may optionally be a synthetic paper made from a plastic film, possibly loaded and / or coated.
  • the paper may contain other security elements (fluorescent fibers, planks, watermarks, chemical falsification reagents, etc.).
  • This paper can be suitable for many applications to combat counterfeiting (entrance tickets to cultural or sporting events, transport tickets, visas, labels in particular for valuables and / or protected by copyright, etc ).
  • the reagent contained in this paper can be introduced en masse or put on its surface by coating, impregnation or sizing or by printing. It can be put in the form of patterns.
  • the authenticating composition can advantageously be put in a felt-tip pen, an ink pen or an ink pad.
  • the erasing composition can be put in a pen.
  • a security paper is made on a FOUDRINIER type paper machine from an aqueous suspension of cellulose fibers and various agents commonly used in stationery.
  • An aqueous composition of potassium thiocyanate at 5% by dry weight is produced. This composition is deposited on the surface of the paper, for example in a size press.
  • An authentication composition is produced by placing an aqueous solution of 100 g / l of copper chloride.
  • An erasing composition is produced by placing an aqueous solution of 100 g / l of sodium sulfite.
  • a colored mark is formed which can range from gray-green to deep black depending on the quantities of each reagent brought into contact (for the quantities cited in the example give a deep black). This mark is removed by applying the composition of sodium sulfite contained for example in another felt pen.
  • the colored mark can be erased several days after its formation.
  • a paper is produced as in Example 1 treated on the surface with the same thiocyanate solution.
  • An authentication composition is produced by placing an aqueous solution of 16 g / l of ferric chloride at a pH less than or equal to 3.
  • An erasing composition is produced by placing 50 g / l of sodium fluoride in aqueous solution.
  • a paper is produced as in Example 1 in a neutral medium; the pH of the paper is around 7.
  • An authentication composition is produced by putting a weak base in aqueous solution, for example sodium carbonate.
  • An erasing composition is produced by placing a weak acid, for example acetic acid, in aqueous solution.
  • a weak acid for example acetic acid

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Credit Cards Or The Like (AREA)
  • Paper (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Abstract

The invention relates to a system for authenticating a security paper. It comprises, in combination: - a security paper comprising a first chemical reactant (1) which does not significantly impair the colour of the paper, - an authenticating composition comprising a second chemical reactant (2) forming a coloured product with (1), - a composition for deleting the coloured product. It preferably comprises: - a security paper comprising a complexant for transition metal ions as reactant (1), - an authenticating composition comprising transition metal ions forming a coloured complex with (1), as reactant (2), - a composition for deleting the coloured complex. Application as paper for banknotes.

Description

La présente invention concerne un papier de sécurité authentifiable à l'aide de moyens formant une trace colorée sur le papier, cette trace étant effaçable.The present invention relates to a security paper which can be authenticated using means forming a colored trace on the paper, this trace being erasable.

On connaît différents papiers de sécurité authentifiables à l'aide de compositions d'authentification. De tels papiers sont décrits par exemple dans la demande de brevet européen EP-A-391 542, déposée par WIGGINS TEAPE. Dans cette demande on décrit un système d'authentification d'un papier de sécurité qui comprend en combinaison, un papier de sécurité comportant à la fois un amidon et un sel d'iodate et une composition d'authentification constituée d'une solution acide d'un iodure, le système étant tel que lorsqu'on applique la composition d'authentification sur le papier de sécurité authentique, l'iode est généré et on produit une coloration amidoniode caractéristique.Various security papers are known which can be authenticated using authentication compositions. Such papers are described, for example, in European patent application EP-A-391,542, filed by WIGGINS TEAPE. In this application, a security paper authentication system is described which comprises, in combination, a security paper comprising both a starch and an iodate salt and an authentication composition consisting of an acidic solution. an iodide, the system being such that when the authentication composition is applied to the authentic security paper, the iodine is generated and a characteristic amidoniode color is produced.

On a décrit aussi dans le brevet allemand DE-C-856 842 un papier qui contient un indicateur de pH, cet indicateur se colorant différemment lorsqu'on humecte le papier avec de l'eau ayant un certain pH. Cependant, le papier ainsi obtenu a la coloration initiale de l'indicateur de pH. Par exemple, si on utilise comme indicateur du bleu de bromophénol, le papier est jaune. Si on humidifie, il se forme une trace bleue.German patent DE-C-856 842 has also described a paper which contains a pH indicator, this indicator coloring differently when the paper is moistened with water having a certain pH. However, the paper thus obtained has the initial coloring of the pH indicator. For example, if bromophenol blue is used as an indicator, the paper is yellow. If you humidify, a blue trace forms.

On a décrit dans le brevet allemand DE-C-397 363, un procédé de fabrication d'un papier de sécurité tel que l'on introduit dans le papier des colorants sulfurés, des colorants au cuivre qui donnent, par traitement avec des agents alcalins ou réducteurs, une coloration qui sous l'action de l'air disparaît à nouveau, de telle sorte que le colorant initial est régénéré.German patent DE-C-397 363 describes a process for manufacturing a security paper such as sulfur dyes, copper dyes which are introduced into the paper by treatment with alkaline agents. or reducing, a color which under the action of air disappears again, so that the initial dye is regenerated.

Cependant, jusqu'à présent, on n'a jamais décrit ni suggéré un système d'authentification qui comprend un papier de sécurité sur lequel on peut réaliser des marques ou traces à l'aide d'une composition d'authentification, les marques étant effaçables par une seconde composition.However, until now, an authentication system has never been described or suggested which includes a security paper on which marks or traces can be produced using an authentication composition, the marks being erasable by a second composition.

Un but de l'invention est donc de pouvoir effectuer une authentification d'un papier de sécurité, cette authentification étant non destructrice.An object of the invention is therefore to be able to carry out an authentication of a security paper, this authentication being non-destructive.

Un autre but de l'invention est de pouvoir contrôler rapidement un papier de sécurité et sans nuire à l'aspect initial du papier.Another object of the invention is to be able to quickly check a security paper and without harming the initial appearance of the paper.

Un autre but de l'invention est d'obtenir un papier de sécurité authentifiable de façon réversible, ce papier ayant une couleur blanche.Another object of the invention is to obtain a reversibly authenticated security paper, this paper having a white color.

A cet effet, l'invention concerne un système d'authentification d'un papier de sécurité comprenant, en combinaison :

  • un papier de sécurité comportant un premier réactif chimique (1) n'altérant pas de façon significative la couleur du papier,
  • une composition d'authentification comprenant un second réactif chimique (2) formant un produit coloré avec (1),
  • une composition d'effacement du produit coloré.
To this end, the invention relates to a system for authenticating a security paper comprising, in combination:
  • a security paper comprising a first chemical reagent (1) which does not significantly alter the color of the paper,
  • an authentication composition comprising a second chemical reagent (2) forming a product colored with (1),
  • a composition for erasing the colored product.

L'invention concerne selon un autre mode de réalisation un système d'authentification d'un papier de sécurité comprenant, en combinaison :

  • un papier de sécurité comportant un premier réactif chimique (1) n'altérant pas de façon significative la couleur du papier,
  • une composition d'effacement du produit coloré, ladite composition étant disposée partiellement à la surface du papier, pour former une zone désensibilisée,
  • une composition d'authentification comprenant un second réactif chimique (2) formant un produit coloré avec (1), hors de la zone désensibilisée.
According to another embodiment, the invention relates to a system for authenticating a security paper comprising, in combination:
  • a security paper comprising a first chemical reagent (1) which does not significantly alter the color of the paper,
  • a composition for erasing the colored product, said composition being partially arranged on the surface of the paper, to form a desensitized zone,
  • an authentication composition comprising a second chemical reagent (2) forming a colored product with (1), outside the desensitized zone.

Dans un premier cas particulier, l'invention concerne un système d'authentification d'un papier de sécurité comprenant, en combinaison :

  • un papier de sécurité comportant comme réactif (1) un complexant des ions des métaux de transition,
  • une composition d'authentification comprenant comme réactif des ions (2) des métaux de transition formant un complexe coloré avec (1),
  • une composition d'effacement du complexe coloré.
In a first particular case, the invention relates to a system for authenticating a security paper comprising, in combination:
  • a security paper comprising as reagent (1) a complexing agent for transition metal ions,
  • an authentication composition comprising, as reactant, ions (2) of transition metals forming a colored complex with (1),
  • a composition for erasing the colored complex.

On peut également envisager que le papier comporte les ions des métaux de transition et que la composition d'authentification comporte le complexant de ces ions.It is also conceivable that the paper comprises the ions of the transition metals and that the authentication composition comprises the complexing agent of these ions.

Pour une combinaison plus particulière, le complexant est l'ion thiocyanate, utilisé sous forme de sels choisis notamment parmi ses sels de potassium ou d'ammonium ou de sodium ; les ions des métaux de transition sont plus préférentiellement des ions du cuivre ou du cobalt, notamment du cuivre II ou du cobalt II, utilisés sous forme de sels comme le chlorure ou le sulfate de cuivre par exemple ; la composition d'effacement comprend un réducteur comme les ions sulfite ou bisulfite.For a more particular combination, the complexing agent is the thiocyanate ion, used in the form of salts chosen in particular from its potassium or ammonium or sodium salts; the transition metal ions are more preferably ions of copper or cobalt, in particular copper II or cobalt II, used in the form of salts such as copper chloride or sulfate, for example; the erasing composition comprises a reducing agent such as sulfite or bisulfite ions.

Selon un mode de réalisation préféré de cette combinaison, le papier comprend un thiocyanate de potassium, la composition d'authentification comprend un chlorure de cuivre et la composition d'effacement comprend du sulfite de sodium.According to a preferred embodiment of this combination, the paper comprises a potassium thiocyanate, the authentication composition comprises a copper chloride and the erasing composition comprises sodium sulfite.

Il est possible qu'inversement le papier comporte le chlorure de cuivre et que la composition d'authentification contienne le thiocyanate.Conversely, the paper may contain copper chloride and the authentication composition may contain thiocyanate.

Pour une autre combinaison plus particulière, le complexant est l'ion thiocyanate, utilisé sous forme de sels choisis notamment parmi ses sels de potassium ou d'ammonium ou de sodium ; les ions des métaux de transition sont des ions du fer, notamment du fer III, utilisés sous forme de ses sels comme le chlorure ferrique; la composition d'effacement comprend des ions fluorures.For another more specific combination, the complexing agent is the thiocyanate ion, used in the form of salts chosen in particular from its potassium or ammonium or sodium salts; the ions transition metals are iron ions, in particular iron III, used in the form of its salts such as ferric chloride; the erasing composition comprises fluoride ions.

Selon un mode de réalisation préféré de cette combinaison, le papier comprend un thiocyanate de potassium; la composition d'authentification comprend du chlorure ferrique à un pH inférieur ou égal à 3; la composition d'effacement comprend du fluorure de sodium.According to a preferred embodiment of this combination, the paper comprises a potassium thiocyanate; the authentication composition comprises ferric chloride at a pH less than or equal to 3; the erasure composition comprises sodium fluoride.

Dans un second cas particulier, l'invention concerne un système d'authentification d'un papier de sécurité comprenant, en combinaison :

  • un papier de sécurité comportant comme réactif (1) un indicateur coloré acido-basique incolore au pH du papier [de préférence à pH neutre (pH=6 à 8)],
  • une composition d'authentification comprenant comme réactif (2) soit un acide soit une base afin d'obtenir l'indicateur sous sa forme colorée,
  • une composition d'effacement comprenant soit une base soit un acide afin d'obtenir à nouveau l'indicateur sous sa forme incolore.
In a second particular case, the invention relates to a system for authenticating a security paper comprising, in combination:
  • a security paper comprising as reagent (1) a colorless acid-base colorless indicator at the pH of the paper [preferably at neutral pH (pH = 6 to 8)],
  • an authentication composition comprising as reagent (2) either an acid or a base in order to obtain the indicator in its colored form,
  • an erasing composition comprising either a base or an acid in order to again obtain the indicator in its colorless form.

Le papier à authentifier est à base de fibres de cellulose et/ou de fibres synthétiques. Il peut s'agir éventuellement d'un papier synthétique réalisé à partir d'un film plastique, éventuellement chargé et/ou couché.The paper to be authenticated is based on cellulose fibers and / or synthetic fibers. It may optionally be a synthetic paper made from a plastic film, possibly loaded and / or coated.

Le papier peut contenir d'autres éléments de sécurité (fibres fluorescentes, planchettes, filigranes, réactifs chimiques d'infalsification, etc...).The paper may contain other security elements (fluorescent fibers, planks, watermarks, chemical falsification reagents, etc.).

Ce papier peut convenir pour de nombreuses applications pour lutter contre la contrefaçon (billets d'entrée à des manifestations culturelles ou sportives, tickets de transport, visas, étiquettes notamment pour objets de valeur et/ou protégés par copyright, etc...).This paper can be suitable for many applications to combat counterfeiting (entrance tickets to cultural or sporting events, transport tickets, visas, labels in particular for valuables and / or protected by copyright, etc ...).

Le réactif que comporte ce papier peut être introduit en masse ou mis sur sa surface par couchage, imprégnation ou encollage ou par impression. Il peut être mis sous la forme de motifs.The reagent contained in this paper can be introduced en masse or put on its surface by coating, impregnation or sizing or by printing. It can be put in the form of patterns.

La composition authentifiante peut être avantageusement mise dans un stylo feutre, un stylo à encre ou un tampon encreur. De même la composition d'effacement peut être mise dans un stylo.The authenticating composition can advantageously be put in a felt-tip pen, an ink pen or an ink pad. Likewise, the erasing composition can be put in a pen.

On peut également envisager un système automatisé pour réaliser l'authentification.We can also consider an automated system to perform authentication.

La description suivante, en regard des exemples annexés, permettra de comprendre comment l'invention peut être mise en pratique.The following description, with reference to the appended examples, will make it possible to understand how the invention can be put into practice.

EXEMPLE 1EXAMPLE 1

On fabrique un papier de sécurité sur une machine à papier du type FOUDRINIER à partir d'une suspension aqueuse de fibres de cellulose et divers agents couramment utilisés en papeterie.A security paper is made on a FOUDRINIER type paper machine from an aqueous suspension of cellulose fibers and various agents commonly used in stationery.

On réalise une composition aqueuse de thiocyanate de potassium à 5 % en poids sec. On dépose cette composition en surface du papier, par exemple en presse encolleuse.An aqueous composition of potassium thiocyanate at 5% by dry weight is produced. This composition is deposited on the surface of the paper, for example in a size press.

On réalise une composition d'authentification en mettant en solution aqueuse 100 g/l de chlorure de cuivre.An authentication composition is produced by placing an aqueous solution of 100 g / l of copper chloride.

On réalise une composition d'effacement en mettant en solution aqueuse 100 g/l de sulfite de sodium.An erasing composition is produced by placing an aqueous solution of 100 g / l of sodium sulfite.

Lorsqu'on applique la composition d'authentification, contenue par exemple dans un stylo feutre, sur le papier à authentifier, il se forme une marque colorée pouvant aller du gris-vert au noir profond selon les quantités de chaque réactif mises en présence (pour les quantités citées dans l'exemple on obtient un noir profond). On fait disparaître cette marque en appliquant la composition de sulfite de sodium contenue par exemple dans un autre stylo feutre.When applying the authentication composition, contained for example in a felt-tip pen, on the paper to be authenticated, a colored mark is formed which can range from gray-green to deep black depending on the quantities of each reagent brought into contact (for the quantities cited in the example give a deep black). This mark is removed by applying the composition of sodium sulfite contained for example in another felt pen.

On a donc pu vérifier l'authenticité du papier sans le dégrader. La marque colorée peut être effacée plusieurs jours après sa formation.We were therefore able to verify the authenticity of the paper without degrading it. The colored mark can be erased several days after its formation.

EXEMPLE COMPARATIFCOMPARATIVE EXAMPLE

On prend un papier quelconque utilisé pour l'impression ou l'écriture. On passe la composition d'authentification sur ce papier,à l'aide d'un stylo contenant cette composition. Aucune marque n'apparaît. On en déduit donc que le papier n'est pas authentique.We take any paper used for printing or writing. We pass the authentication composition on this paper, using a pen containing this composition. No mark appears. We therefore deduce that the paper is not authentic.

EXEMPLE 2EXAMPLE 2

On réalise un papier comme dans l'exemple 1 traitée en surface par la même solution de thiocyanate.A paper is produced as in Example 1 treated on the surface with the same thiocyanate solution.

On réalise une composition d'authentification en mettant en solution aqueuse 16 g/l de chlorure ferrique à un pH inférieur ou égal à 3.An authentication composition is produced by placing an aqueous solution of 16 g / l of ferric chloride at a pH less than or equal to 3.

On réalise une composition d'effacement en mettant en solution aqueuse 50 g/l de fluorure de sodium.An erasing composition is produced by placing 50 g / l of sodium fluoride in aqueous solution.

Lorsqu'on applique la composition d'authentification, contenue par exemple dans un stylo feutre, sur le papier à authentifier, il se forme une marque colorée rouge sang.When applying the authentication composition, contained for example in a felt pen, on the paper to be authenticated, a blood-red colored mark is formed.

On efface cette marque en appliquant la solution de fluorure.This mark is removed by applying the fluoride solution.

Lorsqu'on applique la composition authentifiante sur un papier non traitée il se forme une trace jaune clair, couleur de la solution ferrique.When the authenticating composition is applied to untreated paper, a light yellow trace, the color of the ferric solution, forms.

EXEMPLE 3EXAMPLE 3

On réalise un papier comme dans l'exemple 1 en milieu neutre; le pH du papier est d'environ 7.A paper is produced as in Example 1 in a neutral medium; the pH of the paper is around 7.

On le traite en surface, en presse encolleuse, avec une solution aqueuse d'un indicateur coloré ,la phénolphtaléine à pH 7.It is treated on the surface, in a size press, with an aqueous solution of a colored indicator, phenolphthalein at pH 7.

On réalise une composition d'authentification en mettant en solution aqueuse une base faible, par exemple du carbonate de sodium.An authentication composition is produced by putting a weak base in aqueous solution, for example sodium carbonate.

On réalise une composition d'effacement en mettant en solution aqueuse un acide faible, par exemple de l'acide acétique.An erasing composition is produced by placing a weak acid, for example acetic acid, in aqueous solution.

Lorsqu'on applique la composition authentifiante sur le papier, il se forme une marque colorée rose fuschia.When the authenticating composition is applied to the paper, a fuschia pink colored mark is formed.

Lorsque qu'on applique la composition d'acide acétique, la marque disparaît.When the acetic acid composition is applied, the mark disappears.

Claims (10)

  1. System for the authentication of a security paper comprising, in combination:
    - a security paper containing a first chemical reagent (1) which does not significantly affect the colour of the paper,
    - an authenticating composition comprising a second chemical reagent (2) forming a coloured product with (1),
    - a solid or liquid composition for obliterating the coloured product.
  2. Authentication system according to claim 1, characterized by the fact that it comprises, in combination:
    - a security paper comprising a first chemical reagent (1) which does not significantly affect the colour of the paper,
    - a composition for obliterating the coloured product, said composition being partly applied on the surface of the paper, in order to form a desensitized zone,
    - an authenticating composition comprising a second chemical reagent (2) forming a coloured product with (1), outside the desensitized zone.
  3. Authentication system according to claim 1, characterized by the fact that it contains, in combination:
    - a security paper comprising as reagent (1) a complexing agent for the transition metal ions,
    - an authenticating composition comprising as reagent (2) transition metal ions, forming a coloured complex with (1),
    - a composition for obliterating the coloured complex.
  4. Authentication system according to claim 1, characterized by the fact that it contains, in combination:
    - a security paper comprising transition metal ions as reagent (1),
    - an authenticating composition comprising as reagent (2) a complexing agent for the transition metal ions, forming a coloured complex with (1),
    - a composition for obliterating the coloured complex.
  5. Authentication system according to claims 3 or 4, characterized by the fact that the complexing agent is the thiocyanate ion, that the transition metal ions are copper or cobalt ions, notably copper II or cobalt II ions, and that the obliterating composition contains a reducing agent.
  6. Authentication system according to claim 5, characterized by the fact that the reducing agent is a sulfite or bisulfite ion.
  7. Authentication system according to one of claims 3 to 6, characterized by the fact that the paper comprises potassium or ammonium or sodium thiocyanate, that the authenticating composition comprises copper II sulfate or chloride and that the obliterating composition comprises copper II sulfate or chloride and that the obliterating composition comprises sodium sulfite.
  8. Authentication system according to claim 3, characterized by the fact that the complexing agent is the thiocyanate ion, that the transition metal ions are iron ions, notably iron III ions, and that the obliterating composition comprises fluoride ions.
  9. Authentication system according to one of claims 3 or 8, characterized by the fact that the paper comprises potassium or ammonium or sodium thiocyanate, that the authenticating composition comprises iron chloride (at a pH less than or equal to 3) and that the obliterating composition comprises sodium fluoride.
  10. Authentication system according to claim 1, characterized by the fact that it comprises, in combination:
    - a security paper comprising as reagent (1) an acid-base coloured indicator which is colourless at the pH of the paper,
    - an authenticating composition comprising as reagent (2) either an acid or a base in order to obtain the indicator in its coloured form,
    - a solid or liquid composition comprising either a base or an acid in order to re-obtain the indicator under its colourless form.
EP92401979A 1991-07-29 1992-07-09 System for the reversibel authentification of a security paper Expired - Lifetime EP0530059B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9109549 1991-07-29
FR9109549A FR2679934B1 (en) 1991-07-29 1991-07-29 REVERSIBLE AUTHENTICABLE SECURITY PAPER.

Publications (2)

Publication Number Publication Date
EP0530059A1 EP0530059A1 (en) 1993-03-03
EP0530059B1 true EP0530059B1 (en) 1995-09-20

Family

ID=9415624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401979A Expired - Lifetime EP0530059B1 (en) 1991-07-29 1992-07-09 System for the reversibel authentification of a security paper

Country Status (5)

Country Link
EP (1) EP0530059B1 (en)
AT (1) ATE128201T1 (en)
DE (1) DE69204946T2 (en)
ES (1) ES2080465T3 (en)
FR (1) FR2679934B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10020873A1 (en) * 2000-04-28 2001-11-08 Mitsubishi Hitec Paper Flensbu Temporary authentification mark for security documents uses a substituted phthalide reacting on contact with an alkaline solution, together with a volatile solvent
WO2004087430A1 (en) * 2003-04-02 2004-10-14 Ucb, S.A. Authentication means
US7163909B2 (en) 2004-04-23 2007-01-16 Appleton Papers Inc. Authenticity indicator
FR2907136B1 (en) 2006-10-12 2010-01-15 Arjowiggins SECURITY TAPE, SHEET AND SECURITY DOCUMENT COMPRISING IT AND METHOD OF INCORPORATING IT

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE397363C (en) * 1923-03-30 1924-06-20 Hugo Graefe Process for the production of forgery-proof security paper
US4618402A (en) * 1984-08-10 1986-10-21 Arjomari-Prioux Safety means, paper and document against falsification by chemical agent

Also Published As

Publication number Publication date
DE69204946T2 (en) 1996-03-21
FR2679934A1 (en) 1993-02-05
DE69204946D1 (en) 1995-10-26
ES2080465T3 (en) 1996-02-01
EP0530059A1 (en) 1993-03-03
FR2679934B1 (en) 1993-11-12
ATE128201T1 (en) 1995-10-15

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