A pigment system of different capsule-luminescent pigments have different emission spectra, preferably different color impressions of the luminescence emission, and possess substantially the same chemical stabilities. The capsule-luminescent pigments are based on organic or metalorganic luminescent substances.

A pigment system of different capsule-luminescent pigments have different emission spectra, preferably different color impressions of the luminescence emission, and possess substantially the same chemical stabilities. The capsule-luminescent pigments are based on organic or metalorganic luminescent substances.

Various embodiments disclosed relate to multilayer films including hidden fluorescent features. The present disclosure includes a multilayer optical film including an isotropic multilayer optical film having first and second opposed major surfaces. The isotropic multilayer optical film reflects at least 50% of a light that is at least one of ultraviolet light or visible light, having an incident angle less than a cutoff angle from normal to the first major surface of the isotropic multilayer optical film, wherein the cutoff angle is in a range from 10 to 70. The isotropic multilayer optical film allows at least 50% of the light having an incident angle of more than the cutoff angle from normal to the first major surface of the isotropic multilayer optical film to pass through the isotropic multilayer optical film. The isotropic multilayer optical film includes a marking on the second major surface of the isotropic multilayer optical film, the marking including at least one fluorescent compound. Various embodiments of multilayer optical films described herein are useful, for example, as anti-counterfeiting features, such as in identification documents or cards, currency, labels for pharmaceuticals or other high value products, or financial cards.

Various embodiments disclosed relate to multilayer films including hidden fluorescent features. The present disclosure includes a multilayer optical film including an isotropic multilayer optical film having first and second opposed major surfaces. The isotropic multilayer optical film reflects at least 50% of a light that is at least one of ultraviolet light or visible light, having an incident angle less than a cutoff angle from normal to the first major surface of the isotropic multilayer optical film, wherein the cutoff angle is in a range from 10 to 70. The isotropic multilayer optical film allows at least 50% of the light having an incident angle of more than the cutoff angle from normal to the first major surface of the isotropic multilayer optical film to pass through the isotropic multilayer optical film. The isotropic multilayer optical film includes a marking on the second major surface of the isotropic multilayer optical film, the marking including at least one fluorescent compound. Various embodiments of multilayer optical films described herein are useful, for example, as anti-counterfeiting features, such as in identification documents or cards, currency, labels for pharmaceuticals or other high value products, or financial cards.

An arrangement includes a component and a temperature-dependent, first fluorescent dye, which in a first state has a predetermined first color location and in a second state has a predetermined second color location different from the first color location, and which is disposed on the component or integrated in the component in such a way that the luminescent dye, in dependence on a temperature change acting on it, creates an optically recognizable color change from the first color location to the second color location.

An arrangement includes a component and a temperature-dependent, first fluorescent dye, which in a first state has a predetermined first color location and in a second state has a predetermined second color location different from the first color location, and which is disposed on the component or integrated in the component in such a way that the luminescent dye, in dependence on a temperature change acting on it, creates an optically recognizable color change from the first color location to the second color location.

A method and apparatus for printing a security mark via a non-fluorescent toner is disclosed. For example, the method may be executed by a processor and includes receiving an electronic file of a security mark to be printed on a substrate, determining an amount of halftone coverage for a non-fluorescent toner based on a brightness of the substrate, converting the electronic file of the security mark into a printer description language with the amount of halftone coverage that is determined, and causing the security mark to be printed on the substrate.

A method and apparatus for printing a security mark via a non-fluorescent toner is disclosed. For example, the method may be executed by a processor and includes receiving an electronic file of a security mark to be printed on a substrate, determining an amount of halftone coverage for a non-fluorescent toner based on a brightness of the substrate, converting the electronic file of the security mark into a printer description language with the amount of halftone coverage that is determined, and causing the security mark to be printed on the substrate.

Disclosed embodiments may relate to a time-dependent color-changing label for a product. The label may include a first layer comprising a plurality of particles, the particles comprising a time dependent color-changing material that changes color after a predetermined time period, the predetermined time period being greater than one month. The label may also include an attachment structure attaching the first layer to the product. In certain embodiments, the first layer may include a polymer, and the particles may include glass microspheres containing the time-dependent color changing material. The particles may be embedded in the polymer.

A method and apparatus for printing a security mark via a non-fluorescent toner is disclosed. For example, the method may be executed by a processor and includes receiving an electronic file of a security mark to be printed on a substrate, determining an amount of halftone coverage for a non-fluorescent toner based on a brightness of the substrate, converting the electronic file of the security mark into a printer description language with the amount of halftone coverage that is determined, and causing the security mark to be printed on the substrate.