Provided is a reveal substrate including a release liner base stock layer; an adhesive layer; a label base stock layer; a thermal insulation layer disposed over the label base stock layer; an ink layer disposed over the thermal insulation layer, the ink layer comprising at least one color; a reveal coat layer disposed over the printed ink layer; and a top coat layer disposed over the reveal coat layer. The reveal coat layer includes an acrylic-based composition including light-scattering particles which cause the reveal coat layer to be opaque in a first state and transparent in a second state, the application of at least one of heat and pressure from a print head causing the reveal coat layer to transition from the first state to the second state, thereby enabling the at least one color of the ink layer to be visible through the reveal coat layer.

Provided is a fluoride nanophosphor using, as cores, luminescent nanoparticles expressed by Chemical Formula 1.
LiEr.sub.1-x-yL.sub.yF.sub.4:Tm.sup.3+.sub.x  [Chemical Formula 1] (In Chemical Formula 1, x is a real number satisfying 0≤x≤0.3, y is a real number satisfying 0≤y≤0.8 and is selected within a range satisfying 0≤x+y≤0.9, and L is any one selected from the group consisting of yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), ytterbium (Yb), lutetium (Lu), and a combination thereof.)

Provided is a fluoride nanophosphor using, as cores, luminescent nanoparticles expressed by Chemical Formula 1.
LiEr.sub.1-x-yL.sub.yF.sub.4:Tm.sup.3+.sub.x  [Chemical Formula 1] (In Chemical Formula 1, x is a real number satisfying 0≤x≤0.3, y is a real number satisfying 0≤y≤0.8 and is selected within a range satisfying 0≤x+y≤0.9, and L is any one selected from the group consisting of yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), ytterbium (Yb), lutetium (Lu), and a combination thereof.)

The invention relates to a security and/or value document having a security feature, to an ink for making the security feature, to a method for making such a security and/or value document, and to a method for verifying such a security and/or value document.

The invention relates to a security and/or value document having a security feature, to an ink for making the security feature, to a method for making such a security and/or value document, and to a method for verifying such a security and/or value document.

The identification card includes a glass substrate provided with first and second surfaces facing opposite directions. The first surface of the glass substrate is provided with at least one first recess, and the identification card includes a first resin material layer filled in the first recess; and at least one of a first information storage medium, a first security feature, and a first decorative feature bonded to the first resin material layer. In a variation, an identification card has a ceramic substrate with first and second surfaces facing in opposite directions. The first surface of the ceramic substrate is provided with at least one first recess, and the identification card includes a first resin material layer filled in the first recess(es); and at least one of a first information storage medium, a first security feature, and a first decorative feature bonded to the first resin material layer.

A secure lens sheet or layer suitable for use in a micro-optic system, which is made up of a plurality of joined fine lens arrays (e.g., joined fine lenticular and/or joined fine non-cylindrical lens arrays), is provided. Each array has a lens pitch different from adjacent or contiguous arrays and/or is orientated in a direction different from adjacent or contiguous arrays. A micro-optic security device, which utilizes the inventive secure lens sheet and one or more overlying or underlying arrangements of micro-sized image icons (e.g., line data), is also provided. The image icon arrangement(s) and the secure lens layer are configured such that one or more synthetic images are projected by the security device. These projected images may show a number of different optical effects. With such a combination lens layer, some regions could be optically active when the device is tilted in one direction, some could be active when tilted in the opposite direction, and some areas could be active when the device is tilted in either (or any) direction. The inventive micro-optic security device may be partially embedded in and/or mounted on a surface of a security article (e.g., paper or polymer security document, label, card), or integrated therein.

A thermochromic ink composition includes, in a liquid medium, known as solvent, a dispersion of thermochromic microcapsules incorporating at least one leuco-dye and a thermoplastic binder selected from the group containing polyacrylic polyesters, polyurethanes and copolymers thereof. The composition is characterized in that the solvent is aprotic. A a method for producing a card and such a card incorporating at least one thermochromic pattern produced with a thermochromic ink composition are also described.

A thermochromic ink composition includes, in a liquid medium, known as solvent, a dispersion of thermochromic microcapsules incorporating at least one leuco-dye and a thermoplastic binder selected from the group containing polyacrylic polyesters, polyurethanes and copolymers thereof. The composition is characterized in that the solvent is aprotic. A a method for producing a card and such a card incorporating at least one thermochromic pattern produced with a thermochromic ink composition are also described.

The present invention relates to an improved method for the partial colouring, in particular for the coloured laser engraving, of plastic parts, in particular thermoplastic plastic parts, more particularly thermoplastic plastic parts, comprising a layer structure, and to the resulting partially coloured, preferably coloured and laser engraved, plastic parts, in particular thermoplastic plastic parts.