A method for manufacturing an optically variable security element, so that for a viewer of the security element, a first color impression is created through the combination of at least the color effects of a first embossing lacquer layer and the coating, and a second, different color impression is created through the combination of the color effects of at least the first embossing lacquer layer, a second embossing lacquer layer and a coating.

A micro-optic security device with zonal color transitions includes a planar array of focusing elements, an image icon layer including a plurality of retaining structures, the plurality of retaining structures defining isolated volumes at a first depth within the image icon layer, a first zone of image icons, the first zone of image icons having a first predefined subset of the plurality of retaining structures, wherein the isolated volumes of retaining structures of the first predefined subset of the plurality of retaining structures contain cured pigmented material of a first color, and a second zone of image icons, the second zone of image icons including a second predefined subset of the plurality of retaining structures, wherein the isolated volumes of retaining structures of the second predefined subset of the plurality of retaining structures contain cured pigmented material of a second color, wherein the second color contrasts with the first color.

Provided is an anti-counterfeit marking technique for verifying authenticity of objects using x-ray fluorescence (XRF) analysis.

Provided is an anti-counterfeit marking technique for verifying authenticity of objects using x-ray fluorescence (XRF) analysis.

A method for manufacturing platelet-shaped effect pigments includes the steps of a) providing a carrier substrate; b) applying aqueous washing ink droplets to the carrier substrate in first regions forming a first motif; c) applying a reflective coating to the carrier substrate such that a reflective coating is deposited on the carrier substrate in the form of a regular contiguous grid in second regions forming a second motif outside the first regions forming the first motif, wherein the first regions form the first motif and have the washing ink droplets form regular islands within the regular contiguous grid, and a reflective coating is deposited above the washing ink droplets in the first regions forming the first motif; and d) removing the washing ink droplets in the first regions together with the reflective coating present thereon and isolating the removed reflective coating in the form of platelet-shaped effect pigments.

The disclosure provides an optical anti-counterfeiting element (1) and an optical anti-counterfeiting product (0), which belong to the technical field of optical anti-counterfeiting. The optical anti-counterfeiting element includes: a substrate (2) having a first surface (21) and a second surface (22) opposite each other, at least a partial region of the substrate is transparent; and a first transflective coating (31), a dielectric layer (32) and a second transflective coating (33) which are sequentially deposited on the first surface, wherein a ratio of a refractive index to an extinction coefficient of the first transflective coating is different from a ratio of a refractive index to an extinction coefficient of the second transflective coating. When observed from the first surface, the optical anti-counterfeiting element appears in a relatively bright first color; when observed from the second surface, the optical anti-counterfeiting element appears in a relatively bright second color.

The disclosure provides an optical anti-counterfeiting element and an optical anti-counterfeiting product, the optical anti-counterfeiting element includes: a substrate (2) having a first surface and a second surface opposite to each other; a microstructure formation layer (3) formed on the first surface, the microstructure formation layer (3) includes at least a first region (41), the first region (41) includes at least a first microstructure (5), the first microstructure (5) includes a convex portion and/or a concave portion; and optically variable coatings (4a, 4b) homomorphically covering on the first microstructure (5), the optically variable coatings (4a, 4b) include reflective layers (4a1, 4b1), dielectric layers (4a2, 4b2) and absorption layers (4a3, 4b3) which are stacked in sequence, wherein the reflective layers (4a1, 4b1) or the absorption layers (4a3, 4b3) are in contact with the first microstructure (5), and the dielectric layers (4a2, 4b2) are obtained by coating or printing.

In a general aspect, unique unclonable physical identifiers are applied and used. A method of applying the unique marker can include receiving an object having a surface feature and forming a unique marker on the surface feature of the object. The unique marker includes a distribution of elements and conforms with a morphology of the surface feature. The method further includes extracting orientation information from the unique marker. The orientation information can indicate relative spatial orientations of the respective elements. The method additionally includes generating a unique code for the object based on the orientation information. The surface feature can be facets, surface patterns, textures, or other indentations of the object. The surface feature can include a region of the object that is susceptible to tampering.

A method for changing a geometry of an edge of a portable data carrier, wherein the geometry of the edge is changed in order to work on the edge and the outer side of the data carrier proceeding from a common side, without a spatial location of the data carrier being changed.

A method for changing a geometry of an edge of a portable data carrier, wherein the geometry of the edge is changed in order to work on the edge and the outer side of the data carrier proceeding from a common side, without a spatial location of the data carrier being changed.