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Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper (D21H21/40)

D
Textiles; paper
(3406)
D21
Paper-making; production of cellulose
(949)
D21H
Pulp compositions; preparation thereof not covered by subclasses ; d21c, d21d; impregnating or coating of paper; treatment of finished paper not covered by class ; b31; or subclass d21g; paper not otherwise provided for
(462)
D21H21
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
(222)
D21H21/40
Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper (watermarking b41m0003100000, d21f0001440000; security printing b41m0003140000; securities or banknotes characterised by colour effects b44f0001120000; testing paper currency or valuable papers for genuineness g07d0007000000)
(39)


Article having carrier with protective labelling and method of authenticating article

Article having carrier with protective labelling and method of authenticating article

Article has protective labelling based on composite material, having a given combination of magnetic and optical properties. The optical properties depend on temperature and the magnetic properties provide induction heating of the material only in the presence of an alternating magnetic field with defined parameters.

Method of production of counterfeit-proof paper and corresponding mesh cylinder

Method of production of counterfeit-proof paper and corresponding mesh cylinder

Invention relates to a method of manufacturing counterfeit-proof paper for production of counterfeit-proof documents such as banknotes, identity documents based on plastic cards or the like, with a protective element made in the form of a strip, which is embedded into the counterfeit-proof paper and directed at least on one opening in the counterfeit-proof paper on one of the surfaces of the counterfeit-proof paper. The mesh cylinder of a cylinder paper-making machine takes the pulp in the form of the fibre-water slurry from the tub. In addition, the invention relates to the mesh cylinder of a cylinder paper-making machine to manufacture the respective counterfeit-proof paper. According to the invention, on the mesh cylinder for each unit of use at least one first raised platform is applied, which is formed by a closed frame which encloses at least one recess. On the mesh cylinder at least one other raised platform is applied, which performs direction of the protective element made in the form of a strip in the transverse direction so that the protective element made in the form of a strip is placed on the first raised platform and does not protrude or protrudes only slightly beyond the first raised platform on its both longitudinal sides, at that inside the first raised platform the fibre-water slurry cannot agglomerate.

Method of production of security paper, security paper and valuable document

Method of production of security paper consists in adding to the paper pulp of protective markers on a carrier. The carrier is used as particles or a mixture of particles of a polymeric hydrogel. The maximum particle size of the hydrogel is up to 1000 microns.

Multilayer protected composition (versions) and article of such composition

Multilayer protected composition (versions) and article of such composition

Multilayer protected composition is formed with an additional multilayer element. The element is formed on the paper surface. The element comprises a multi-colour coating in the form of periodic raster formed by at least two paints of different colours contrasting relative to the paper surface. The paints contain luminescent compounds having daily luminescence in the visible range of light under the influence of natural lighting. The combinations of paints are such that the integral colour of the additional multilayer protected element is visually perceived as unsaturated close to achromatic. One of the embodiments of the protected element forms graphic shape or is part of a graphic shape, which changes its visual display due to changing its colour grade and/or optical density and/or saturation when copying the document on a printing device operating in a colour system CMYK.

Valuable document protected against forgery and method of determining its authenticity

Invention relates to the field of protection of valuable documents against forgery. The valuable document comprises on its surface an invisible protective marking applied on the elongated section along the long side of the document, which is intended for the instrument reading. The protective marking has the property of selective absorption of the radiation in the range optical spectrum from 0.76 mcm to 10 mcm. The marking is wholly or partially located in the area of additional masking marking. The material of the latter has the property of re-radiation when exposed of the exciting radiation of the same spectral composition as the material of the protective marking, but is characterised with magnitude of afterglow time. The method of determining the authenticity of the valuable document comprises revealing the hidden security marking on the valuable document. The revealing of marking is carried out by registration of afterglow of its material after removal of the exciting radiation and/or by registration of the diffuse reflection of the material in the optical range of wavelengths from 0.76 mcm to 10 mcm. Violation of the predetermined information indicates full or partial forgery.

Method of inspecting paper and apparatus therefor (versions)

Method of inspecting paper and apparatus therefor (versions)

Method of inspecting paper with optical protective marks on banknote threads involves synthesis of a flat optical element with an asymmetric microrelief. An asymmetric image is formed in an optical element to allow automatic inspection, invariant to the shift of the banknote and turning thereof within 10 degrees when the protective mark is illuminated with a laser beam perpendicular to the plane of the banknote. The image is in form of bright sections, parallel to the direction of movement of the banknote in the channel of a counting and sorting device, lying in the focal plane, parallel to the plane of the banknote, or in planes Q1 and Q2, each inclined to the plane of the banknote by an angle α, which is less than 60 degrees. The line of intersection of planes Q1 and Q2 is parallel to the direction of movement of the banknote. The control feature for identification is the distance from each of the sections to the laser beam. The apparatus for inspecting paper with optical protective marks on banknote threads includes a diode laser, a detection system, an electronic unit for recording information from a line of photodiodes and an electronic unit which performs automatic inspection. The diode layer emits a laser beam perpendicular to the plane of the banknote.

Sandwich product protected against forgery, and its production method

Sandwich product protected against forgery includes sheets of paper with protective elements, which are saturated with a polymer binding agent, and external polymer layers. Sheets of paper are saturated in molten thermoreactive or thermoplastic polymer throughout the volume and surfaces of each sheet are coated with a polymer layer; besides, the product surfaces are of a relief type. A manufacturing method involves saturation of sheets of paper with protective elements with the molten thermoreactive or thermoplastic polymer, or with their mixtures, drying with partial polymerisation, assembly of a pack of saturated sheets, hot pressing lamination with simultaneous formation of surface relief and products of the specified geometrical shape.

Counterfeit-protected data medium and method for production thereof

Counterfeit-protected data medium and method for production thereof

Graphic elements are deposited using printing techniques on one or both sides of the medium, wherein mutual arrangement thereof is such that said elements form an image having an optically variable effect. The graphic elements are deposited by scratch-off printing while meeting the following conditions: engraving groove depth should not exceed 14 mcm and the width of the graphic elements should be of the order of the thickness of the data medium. The obtained data medium retains its flatness. The thickness of the paint layer is in the range of 3 to 10 mcm.

Method of papermaking with multi-tone watermark, paper with multi-tone watermark, printing product with multi-tone watermark

Method of papermaking with multi-tone watermark, paper with multi-tone watermark, printing product with multi-tone watermark

Method of papermaking with multi-tone watermark lies in the use for casting and moulding of the paper web on a papermaking machine of the relief mask representing a partially water-permeable moulding element. The element is formed on the surface of the cylinder forming fabric, or on the dandy roll of the fourdrinier former. The mask has a variable height of the image area of the watermark, created by the relief stamping of the fabric, with electrotype and/or conjoint stamping of the fabric and electrotype and/or use of several layers of the electrotype. Individual, successive layers of electrotype in the mask can have openings which are different in the diameter and the density of location. The mask is assembled out of several layers of perforated plates of metal or plastic plates or composite materials. The paper and printing product made by the above method is claimed, which are protected against forgery.

Method of making protective element with bilateral coat

Method of making protective element with bilateral coat

Invention relates to making of protective element having substrate with at least one opening covered on one side by translucent film. Said film is applied over solid translucent coat on the substrate top and bottom sides. Note here that coat forming material is applied in large amount in zone of said opening or said opening is filled with filler completely prior to coat application.

Covered document

Covered document

Covered document contains a substrate, visible authenticating element, as well as a control area which boundaries are at least partially defined by the authenticating element, and the authenticating element, at least partially restricts the contour of the control area and/or is used for positioning the control area. The control area has many identifying elements that differ from the specified authenticating element, and the control area carries the identifying information displaying at least one feature of identifying elements, in particular spatial or physical feature. Identification information is associated with the feature of the control area, in particular spatial and/or physical feature, at that the said information relates to one spatial and/or physical feature of identifying elements. Identifying elements are randomly dispersed within the control area and/or made for emission of a particular signal at the external, in particular optoelectronic, electromagnetic, electrical, magnetic, thermal or acoustic influence.

Method of producing fibrous layer containing element of assigned thickness, forming fabric for its manufacture, method of manufacture of such fabric and protective sheet with such layer

Method of producing fibrous layer containing element of assigned thickness, forming fabric for its manufacture, method of manufacture of such fabric and protective sheet with such layer

Method of wet manufacturing a fibrous layer on a forming fabric of a paper machine, having a pile of fabrics. Wherein the said pile of fabrics includes superimposed front fabric and at least one subfabric, and the fibrous layer contains at least one element of an assigned thickness. At that the method includes a stage of forming the said layer by pulp dewatering on the forming fabric, which pile of fabrics has an area of low dehydration, compared to the first subfabric, at a level of at least one subfabric and/or under the front fabric. And the area of low dehydration meets the location of the said element. The group of inventions also relates to a forming fabric, to a method for its manufacture, to a protective sheet obtained in the above manner, and to covered document obtained from the protected sheet.

Small-sized protective element with through hole and sheet with such elements

Small-sized protective element with through hole and sheet with such elements

Invention relates to a flat protective element of comparatively small size, for instance, to a pad, and also to a material that contains such elements, to secured documents made from such material, and to the method of manufacturing of these elements. The specified protective element comprises at least one through hole.

Counterfeit-proof paper

Counterfeit-proof paper

Counterfeit-proof paper comprises a transparent, at least at some areas, film element, which is freely accessible, at least at some areas, via counterfeit-proof paper. The film element is connected to counterfeit-proof paper by means of an adhesive layer, which is highly transparent and clear in the region of freely accessible areas. The adhesive layer for at least one of freely accessible areas includes a groove, which substantially covers this area surface. The groove in the form of a freely accessible area has an adhesive layer, which is 1-2 mm less or 1-2 mm more than this area. The adhesive layer in the area of at least one of freely accessible areas, apart from the groove, has an ornamental area, on which the adhesive layer is applied in the form of ornaments, symbols or a code. Also a film elements is proposed, and a method to manufacture counterfeit-proof paper or a valuable documents (its version).

Structure for secured and/or valuable documents, document, packing facility, sheet material, method of structure making (its versions) and method to authenticate and/or identify such structure

Structure for secured and/or valuable documents, document, packing facility, sheet material, method of structure making (its versions) and method to authenticate and/or identify such structure

Structure is intended for secured and/or valuable documents. It contains at least one substrate of fibre material, optionally, at least one surface layer applied onto one surface of substrate. At the same time the specified surface layer comprises coating or surface pigments and at least one binder. It also contains multiple various elements of substrate and/or optionally of a surface layer, distributed in a random manner inside the substrate and/or optionally the surface layer, and at least one portion of authenticating and/or identifying information is related to at least one spatial and/or physical criterion of at least part of specified various elements. Also a document, a packing facility and a sheet material are proposed with application of the above-specified structure. A method to make such a structure, its versions and a method to authenticate and/or identify the structure are also proposed.

Sheet material with window, method of its manufacturing and protected document with such material

Sheet material with window, method of its manufacturing and protected document with such material

Sheet material, a protective sheet and a protected document include at least two layers applied one onto the other. Besides, the first layer contains at least one lengthy section of zero thickness, and the second layer contains at least one groove, at the same time the specified at least one groove in the second layer is arranged opposite to the specified at least one section of zero thickness of the first layer, thus forming a window. Methods relate to manufacturing of sheet material and making a protected sheet. Method to make a sheet material includes the following stages. Making the first layer of paper specified above by filtration of cellulose fibre suspension on the metal cloth of the first cylindrical shape or a forming device. Making the second layer of paper on the metal cloth of the second cylindrical shape with formation of at least one groove in the second layer. Then two layers are combined and dried. Method to make a protective sheet repeats the above-specified method with inclusion of the stage, where at least partially transparent element is fixed in the longitudinal section of zero thickness of the first layer of the sheet material.

Paper with high extent of counterfeit protection and method of its manufacturing

Paper with high extent of counterfeit protection and method of its manufacturing

Paper contains one or more elements of counterfeit protection, included into specific areas on or inside paper. Polymer item is arranged in the form of polymer film, strips of polymer film included onto/cast onto/coating polymer film. Polymer strips/threads are woven or combined to each other into a package by textile method. Method includes working operation of placing polymer item, comprising counterfeit protection element (elements) onto paper pulp cloth in process of paper manufacturing. Method includes integration of one or more following working operations in process of paper manufacturing: a) application in such a manner that one or more specified polymer items stick to layer of moist cloth of paper pulp after specified layer is formed in process of paper making; b) application in such a manner so that at least one layer made of one or more specified polymer items sticks to previously moulded layer of moist cloth of paper pulp after specified layer of moist cloth of paper pulp is formed in process of specified paper making.

Counterfeit-proof document

Counterfeit-proof document

Counterfeit-proof document relates to data media. It contains graphical ornament for visual reproduction of data on a person and/or item. Ornament includes at least one image and/or text data, and with the help of specified printing logic it is applied onto secured document so that it has electromagnet characteristic specified by printing logic and read by means of logical circuit contained in secured document. Electromagnetic characteristic of electroconductive ornament is inductance, capacitance or frequency characteristic. Graphical ornament is applied onto secured document in the form of linear raster. At the same time lines of linear raster are joined to each other in the form of meander or are arranged in parallel. Version of counterfeit-proof document is the document with graphical ornament applied by electroconductive invisible paint transparent for human eye onto counterfeit-proof document. Other characteristics of this document are identical to characteristics of the first version document specified above.

Protected document with dirt and/or moisture resistance

Method is intended to impart dirt and/or moisture resistance to porous substrate for protected documents, and also relates to dirt and/or moisture resistant protected document. Method includes application of dirt and/or moisture resistant compound onto opposite surfaces of porous substrate having porosity of approximately 20-100 millilitres per minutes and its impression into pores of substrate. At the same time compound penetrates and spreads at least in part of substrate thickness, then excess compound is removed from opposite surfaces of substrate. Coating press is used to impress dirt and/or moisture resistant compound into pores of substrate.

Protective element

Protective element

Invention relates to valuable article, transferable material and manufacturing method of such protective elements and valuable articles, and also to inspection method of such protective element and valuable article respectively. Valuable article with protective element, which has at least one liquid-crystal material leading to linear polarisation of light used for radiation of protective element. Protective element used for protection of valuable articles from forfeit has at least one liquid-crystal material. Transferable material for protective element manufacturing has base surface where there is at least one liquid-crystal material formed by lyotropic liquid crystals. Manufacturing method of valuable article or protective element includes application to the base of one lyotropic liquid material at least.

Improvement of substrates that include protective devices

Improvement of substrates that include protective devices

Protected substrate is intended for production of valuable document, such as banknote, passport, bond, certificate, voucher or other valuable documents. Protected substrate contains fibrous substrate and protective device. Protective device contains at least partially light-transmitting polymer bearing layer, which bears the first protective criterion. Substrate is provided with the second protective criterion. The first and second protective criteria have such shape and mutual location so that when one side of protected substrate is looked at in passing light, the first and second protective criteria visually interact to form the first composite image that is not visible in reflected light.

Method of identifying counterfeit protected object, and device for identifying counterfeit protected object

Method of identifying counterfeit protected object, and device for identifying counterfeit protected object

Present invention pertains to methods of identifying products made from of sheet material with protective elements, in form of magnetic material fibres. The method of identifying a counterfeit protected object involves movement of sheet material with magnetic protective fibres by passing it through a magnetic field, registration of the amplitude of the response signal of the protective fibres, determination of the distribution function of the amplitudes of the response signals of the protective fibres and evaluation of the identity of the object through comparison of the distribution function of the amplitudes of the response signals of the fibres with preset values of the given function. Magnetic conductance of the protective fibres is also measured and its distribution function is determined. The object is identified through correlation of the distribution function of the amplitudes of the response signals of the protective fibres and the distribution function of magnetic conductance of the protective fibres with preset values of the respective functions. The device for identifying a counterfeit protected object comprises an apparatus for generating an alternating driving magnetic field, apparatus for picking up the response magnetic field, comprising a channel for registering the amplitude of the response signal of the protective element and apparatus for processing the obtained signal values. The apparatus for picking up signals also contains a channel for measuring magnetic conductance of protective fibres. The apparatus for processing the obtained signal values is in form of processor module for determining correlation of the differences between the distribution functions of the amplitudes of response signals and magnetic conductance of protective of protective fibres and preset values of the respective functions.

Paper protected against forgery and associated method

Paper protected against forgery and associated method

Protected against forgery paper is intended for valuable documents production such as bank-papers, passports, identity cards or other similar documents. It is provided with flat base (12) which is ensured with dirt-resistant protection coating (14) to increase paper durability and circulation period. Protection coating (14) consists of at least two lacquer layers (16, 18). Bottom layer (16) is formed by the layer applied to the base by means of lacquer with physical drying properties. This layer ensures contact with underlying base (12) and fills in and closes base pores. Physically drying lacquer consists of water-based disperse lacquer and/or polyurethane, and/or water dispersion of polyester from aliphatic polyester, or water dispersion of acryl sterol polyurethanes. The second top lacquer layer (18) protects base (12) from physical and chemical effects and is formed by radiation-solidified layer and/or physically drying lacquer consisting of UF-protected lacquer, water-based disperse lacquer or combined lacquer. Method relates to production of protected from forgery paper. It includes preparation of flat base, application of physically drying lacquer and top protection coating.

Cardboard and method of production

Cardboard and method of production

Cardboard is used in products which originality should be confirmed. Cardboard contains filamentary matrix with two surfaces. Back surface of filamentary matrix includes layer of surface sizing compound containing marking agent in the form of particles less than 50 mcm in size. For cardboard production filamentary matrix is used, which surface is sized from at least one side representing back side of cardboard. Marking agent in the form of particles of less than 50 mcm size is introduced into sizing compound and marking agent particles are fixed on cardboard. Filamentary matrix is subject to surface sizing in pot or in film and sizing press or by means of doctoring device.

Counterfeit-proof paper, method and apparatus for manufacturing the same

Counterfeit-proof paper, method and apparatus for manufacturing the same

Counterfeit-proof paper has through opening made during papermaking process and free from definitely delimited edge on its edge portion. Paper may consist of two layers, first layer being provided with window formed during papermaking process. Paper comprises through opening having sizes less than window sizes. Method for manufacturing cloth of papermaking machine involves furnishing cloth with flexible or movable continuity disturbing member which prevents accumulation of pulp on cloth portion occupied by said member; forming paper web furnished with through opening; withdrawing paper web from cloth so that continuity disturbing member is deformed or sunk under cloth.

Highly anticorrosive metallic pigments

Highly anticorrosive metallic pigments

The invention is pertaining to production of the of the highly anticorrosive metallic pigments similar to laminas, which may be used in production of the printing ink, plastic materials, cosmetics, the powder coatings and in other branches of industry. The pigments have on their surfaces: the metallic substrates similar to the laminas and treated with the compounds of the phosphoric acid and-or the compounds of the boric acid; one or more layers of the coatings consisting of one or more hydrated oxides of the metals of one or more metals selected from the group, which includes silicon, aluminum, zirconium, titanium and tin. On the basis of the highly corrosive metallic pigments similar to laminas it is possible to produce the interferential colored pigments. The invention allows to increase the anticorrosive resistance of the metallic pigments at the expense of saving without the faults of the initial surface smoothness of the similar to the laminas metallic substrates, to increase the homogeneity and density of the layers of the hydrated oxides of the metals.

Composition of the paint including the optically changeable pigments, application of such composition, the optically- changed pigment and the method of treatment of such pigment

The invention may be used in production of the optically changeable pigments. The optically changeable pigment includes the stratified set composed of the different materials, in which, at least, one of the layers represents the reflecting layer and, at least, one of the other layers represents the dielectric layer. At least, one of the surfaces of the indicated layers is subjected to the chemical action. The indicated materials also include, at least, one of the layers, which represents the semitransparent metallic layer made out of chromium and also one or more metals and-or their inorganic compounds. At that the metal and-or its inorganic compound are subject to corrosion. The subjected to the chemical action surface of the reflecting and dielectric layer along the edge of the layering block of the edge structure of the pigment is coated with the passivating agent, which is selected from the group consisting of the organic esters and the fluorinated organic esters of the phosphoric acid, having the following structural formula: (Rf-CH2-CH2-O)xP(O)(OH)y, where Rf=F-(CF2-CF2)z, х=1 or 2, у=2 or 1, х+у=3, z=l-7. The composition of the printing paint includes the binding system, water and the optically changeable pigment. The invention allows to diminish oxidation of the metallic layers and dissolution of the dielectric layers of the optically changeable pigment and to use it in the compositions of the printing paint.

Method for controlling of authenticity of paper security

Method for controlling of authenticity of paper security

Method involves moving paper with magnetic authenticity agents distributed within paper with predetermined distribution function through alternating magnetic field; registering electromagnetic radiation from each of magnetic authenticity agents; determining their number and evaluating authenticity degree of paper; before evaluating the degree of authenticity, moving paper through light radiation; registering intensity distribution of reflected light radiation; evaluating degree of authenticity by controlling mutually identical correspondence between intensity distribution of reflected light radiation and distribution function of magnetic authenticity agents.

Method for manufacturing of valuable papers protected from counterfeit

Method involves providing uniform introduction into paper of microelement additives in the form of compounds of alkaline elements of Li, Rb, Cs as protection means; controlling presence of counterfeit protection means including analysis of mass of secondary ions forced out from paper by primary charged particle beam, i.e., accomplishing elementary and isotopic analysis at high localization making up to 0.1 micron; introducing microelement additives throughout the volume, over surface or into paper.

Paper containing watermarks and/or embossed members

Paper containing watermarks and/or embossed members

Paper sheet has at least three corners and three sides connected in said corners, wherein angular strengthening watermarks are formed in each of said corners. Alternatively or in addition to it, angular strengthening embossing members are formed in each of said corners. Also, according to another version, paper sheet has at least three corners and three sides connected in said corners, wherein edge strengthening watermarks are formed in the vicinity of mid portion of each of said edges or said watermarks cover mid portion of each of said edges.

Electrochemical indicating device and method for manufacturing counterfeit-protected security paper

Electrochemical indicating device and method for manufacturing counterfeit-protected security paper

Method involves applying chemical substances introduced in the amount of 0.1-1% of paper sheet weight.

Counterfeit-protected security paper and method for manufacturing counterfeit-protected security paper

Method involves treating a part of suspension ingredients, selected from cellulose fibers or powder-like filler, with a color-producing reagent.

Paper/cardboard with protection means and method for producing of paper/cardboard with protection means

Paper/cardboard with protection means and method for producing of paper/cardboard with protection means

Paper/cardboard with protection means comprises paper base and cardboard base having one or more layers of cellulose fibers and surface-processed layer adjoining at least one side of paper/cardboard base, of which layers at least one layer is part of at least one local deviation defining distinctive sign on paper/cardboard. Local deviation comprises locally compressed material and locally surface-processed layer having thickness exceeding thickness of respective surface-processed layer disposed around and outside indicated layer. Method for producing of paper/cardboard with protection means is also described.

Method for producing paper protected from falsification

Method involves using polymer material with additives as material for producing protection filaments.

Paper protected against simulation, provided with coding of luminescent blended fibers

Paper protected against simulation, provided with coding of luminescent blended fibers

The paper protected against simulation, having blended fibers at least of two types that differ in their luminessent properties and form a coding or coded combination. There are at least two definite separate sections, on which blended fiber of only one type are available. The coding or coded combination is formed due to a definite geometrical layout of such separate sections on the paper protected against simulation and/or due to the presence or absence of blended fibers of a definite type. According to the second modification, similar blended fibers are present on both separate sections.

Method for manufacture of securities, metallographic printing form for manufacture of securities, and securities

Method for manufacture of securities, metallographic printing form for manufacture of securities, and securities

Method involves providing protrusions of equal width at their base portion and of various cross section at apexes within the range of length of each protrusion.

Method for manufacture of securities, metallographic printing form for manufacture of securities, and securities

Method for manufacture of securities, metallographic printing form for manufacture of securities, and securities

Method involves providing pattern comprising combination of ink layer protrusions and slots therebetween, with width of ink layer protrusions making at least 0.5 mm.

Metallographic printing form for manufacture of securities, method for manufacture of securities (versions) and securities (versions)

Metallographic printing form for manufacture of securities, method for manufacture of securities (versions) and securities (versions)

Metallographic printing form has printing members disposed on working surface and made in the form of deepened strokes having cross section profile of asymmetric shape with various angles of inclination of side faces.

Protection-attribute combination for important documents

Important document, mainly bank note or person certificate is characterized by use at least of two luminophors whose luminescent properties may be automatically and individually monitored. First luminophore irreversibly losses its luminescent properties at first temperature. Second luminophore irreversibly losses its luminescent properties at second temperature. First and (or) second temperature exceeds natural temperature of burning important document. It allows to identify document according to itself and also according to its ash and prevents possibility of illegal regeneration of materials designed for protecting against counterfeit in order to make duplicates of documents.

Protecting means for safety paper

Safety paper has a layer characterized by variable optical properties, made semitransparent, with transparency from 20 to 80%, and provided with coloring agent composed of optically changeable pigments.

Another patent 2550861.

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