An IR and/or UV machine-readable optical security device (e.g., micro-optic security thread) that is made up of at least one IR-absorbing component with a characteristic IR signature detectable at two or more IR-wavelengths, at least one UV-absorbing component with a characteristic UV signature detectable at two or more UV-wavelengths, at least one IR-absorbing component that absorbs IR light and emits light at a different invisible wavelength, at least one UV-absorbing component that absorbs UV light and emits light at a different invisible wavelength, or a combination thereof, is provided. The IR and UV machine-readable features do not interfere with the optical effects projected by the optical material.

An IR and/or UV machine-readable optical security device (e.g., micro-optic security thread) that is made up of at least one IR-absorbing component with a characteristic IR signature detectable at two or more IR-wavelengths, at least one UV-absorbing component with a characteristic UV signature detectable at two or more UV-wavelengths, at least one IR-absorbing component that absorbs IR light and emits light at a different invisible wavelength, at least one UV-absorbing component that absorbs UV light and emits light at a different invisible wavelength, or a combination thereof, is provided. The IR and UV machine-readable features do not interfere with the optical effects projected by the optical material.

The present invention provides spectral code strategies that allow spectral codes to be accurately and consistently deployed in a wide range of substrates and background situations. The present invention uses taggant particles with a multilayer structure that is able to produce a strong, consistent spectral signal that is resistant to background noise effects. The spectral output can be read remotely from a distance using multispectral, particularly hyperspectral, imaging techniques.

The present disclosure is directed towards a security sheet (10) for displaying personal data (11) comprising a plastic substrate (12) comprising first and second outer surfaces (13, 14). A first opaque region (21) extends partially across the plastic substrate (12) between the first and second outer surfaces (13, 14). A first window (50) is at least partially surrounded by the first opaque region (21). A security device (51) comprises a transparent first device region (52) and a second device region (53) formed from a second device insert (55). The first and second device regions (52, 53) have different optical detection characteristics. The security device (51) is arranged in the plastic substrate (12) such that, when viewed in reflected light incident upon the first outer surface (13), at least part of the first device region (52) is visible at least partially around the second device region (53) in the first window (50).

Provided is an ink set for security image recording comprising an infrared-absorbing ink jet ink which contains a polymerizable compound and an infrared absorbing dye and in which a maximum value of an absorbance in a wavelength range of 750 nm to 1,000 nm is larger than a maximum value of an absorbance in a wavelength range of 400 nm to 750 nm, and color ink jet inks which each contain a polymerizable compound and a colored colorant and satisfy a ratio of a maximum value of an absorbance of each of the color ink jet inks in a wavelength range of 750 nm to 1,000 nm to the maximum value of the absorbance of the infrared-absorbing ink jet ink in a wavelength range of 750 nm to 1,000 nm of 0.10 or less. Also provided are applications of the ink set.

A table game management system according to the present invention includes a camera that images a game token placed on a game table, and a management control device that grasps a type of the game token placed on the game table based on a color of a side face of the game token imaged by the camera.

A table game management system according to the present invention includes a camera that images a game token placed on a game table, and a management control device that grasps a type of the game token placed on the game table based on a color of a side face of the game token imaged by the camera.

Methods for product authentication, which include: providing an article having a substrate with an analyte encoded composition; obtaining a sample of the composition; applying the sample to a test device to obtain test results, analyzing test results from the test device using an electronic device communicatively connected to an authentication authority, wherein the electronic device transmits the test device code and the test results to the authentication authority and confirms or denies authentication after comparison to an authentication database of authentic test results.

Methods for product authentication, which include: providing an article having a substrate with an analyte encoded composition; obtaining a sample of the composition; applying the sample to a test device to obtain test results, analyzing test results from the test device using an electronic device communicatively connected to an authentication authority, wherein the electronic device transmits the test device code and the test results to the authentication authority and confirms or denies authentication after comparison to an authentication database of authentic test results.

An image display element includes a display layer configured to display first to n-th (where n is an integer of 2 or more) images; a light-shielding pattern layer disposed opposite to the display layer and having alternately disposed light-shielding parts and light-transmitting parts, and a transparent layer disposed between the display layer and the light-shielding pattern layer. The display layer contains a coloring matter, where the coloring matter forms first to n-th images; each of the first to n-th images is divided in a discrete manner corresponding to the arrangement pattern of the light-transmitting parts; and an image visible through the light-shielding pattern layer changes depending on the angle from which the light-shielding pattern layer is viewed.