An ink composition useful for digital offset printing applications comprises a photochromic material and a plurality of curable compounds. The compounds have Hansen solubility parameters as described herein, and the resulting ink composition is both compatible with certain dampening fluids and has certain rheological properties, including a low viscosity. The photochromic ink compositions are useful for providing security information in certain printing applications.

This application relates to a time-temperature indicator based on increased thermal reactivity of diacetylene upon melt recrystallization and a method of making it. A diacetylene is crystallized into a low thermal reactivity phase from a solvent system and converted into a higher thermal reactivity phase and low sensitivity to UV light by melt recrystallization.

Infrared dyes having an infrared absorption maximum above 1130 nm with minor colouration in the visual spectrum. The infrared dyes are especially useful for producing multicolour laser marked security documents having reduced background coloration and enhanced colour gamut.

A laser markable material includes a laser markable layer, present as a self-supporting layer or as a layer on a support, the laser markable layer including an infrared absorbing dye and an infrared absorbing pigment, characterized in that the amount of the infrared absorbing pigment is between 10 ppm and 1000 ppm relative to the total dry weight of the laser markable layer.

A method of manufacturing a security device component includes: providing a photosensitive film including a diazonium compound which decomposes upon exposure to radiation of a predetermined wavelength; providing a dye coupler film comprising one or more dye coupler compositions; exposing elements of the photosensitive film to radiation of the predetermined wavelength in accordance with a predetermined pattern; and contacting at least part of the exposed photosensitive film against at least part of the dye coupler film so as to effect at least partial transfer of the one or more dye coupler compositions to the exposed photosensitive film, whereupon unexposed elements of the photosensitive film exhibit one or more colours such that the photosensitive film exhibits a reproduction of the predetermined pattern.

Infrared dyes having an infrared absorption maximum above 1130 nm with minor colouration in the visual spectrum. The infrared dyes are especially useful for producing multicolour laser marked security documents having reduced background coloration and enhanced colour gamut.

Non-fungible anti-counterfeit photo-chromic nano-micro three-dimensional tags/labels are designed in such a manner that duplication and counterfeiting of the labels are prevented. The label comprises of a frame quick response (QR) code part (103), which surrounds a three-dimensional sticker part, which consists of a foundation paper (113) made of cellulose, a non-fungible three-dimensional (3D) structure and a fade-resistant transparent plastic sheet (201). The structure consists of multi-colored micro particles (107), silica-infused 3D macro particles (109) and the photo-chromic nano particles (111). The sheet is laminated on the paper after application of dense coating of particles. The code part contains all information about the sticker part and is scannable by a specific application module, which allows to scan the code part to recognize the data in the code part, to direct the data to a customer's database server, which instantly maps the code data with the scanned image that is stored in its database to verify label authenticity. If the data matches with each other, the backend server sends a message to the application module that the product is genuine. In case of any variation between the scanned and stored data, the system sends a counterfeit alert to the application user, instantly requests to take the GPS coordinates of the location and sends report to manufacturer's designated contact.