A process for preparing a glass product with marking and the glass product with marking obtained according to the process thereof are described. The process includes 1) coating an ink composition onto a surface of a glass substrate, and 2) heating the glass substrate obtained in step 1). The obtained glass product includes a marking that contains particles having a size of from 150 to 600 nm.

A means and method to enhance the security of personalized and variable print-on-demand data on vital records or documents, such as checks, by inkjet printing. A specially formulated penetrating ink prints information on the front side to create an indelibly seamless “dual image” on the reverse side. The reverse image symbiotically complements the primary image on the print side to provide ease of authentication and tamper resistance. Specially formulated MICR ink is used to print information on the front side. Specially formulated penetrating may be different color. Either invisible ultraviolet fluorescent penetrating ink or visible penetrating ink may be used to create the image on the reverse side. The print side and reverse side are printed using single-pen printing by orienting inkjet two different pens in a series.

Disclosed is a device and process for marking and detecting labels with spectral band authentication features utilizing a reader that can be affixed to a smart phone and positioned so as to align the lens of the phone's camera with a reader aperture. The reader aperture allows the camera to view an item through a spacer, wherein a UV and IR light source is used to reveal indicia within invisible ink. The light source employs a distinct emission spectrum characterized by narrow peaks and gaps which can illuminate pigment of the invisible ink that is selectively responsive at the wavelengths of specific peaks and/or unresponsive at the gaps in the spectrum. The smart phone captures the indicia revealed and interfaces with a cloud-based database to provide verification of authenticity.

The present invention relates to a method for producing water-insoluble quantum dot patterns on and/or within a substrate. The method comprises a step of depositing a deliquescent salt, quantum dots and an acid or salt thereof onto at least one surface region of a substrate such that the deliquescent salt, the quantum dots and the acid or salt thereof are at least partially contacted to form said at least one water-insoluble pattern.

The absorbance or emission wavelength of composite materials comprising a transition metal doped shell disposed over a rare earth doped core and a functionalizable group on the surface of the transition metal doped shell can change upon subjection to a carboxylic acid. This method of changing the absorbance or emission wavelength of a composite material can be used to identify counterfeit currency using an ink comprising a composite material.

Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one two-dimensional array of elongate laser-modified tracks extending within a document substrate that have a distinct optical refractive index compared to the unmodified substrate, which can exhibit excellent diffractive effects. Also disclosed are the use of such devices for document authentication and methods for their production.

The present invention relates to a method 500 for digital printing on a substrate 100. The method comprising the following steps: a. providing 510 the substrate 100, and b. digital printing 530 at least one ceramic ink on the substrate 100. The at least one ceramic ink comprises a spectral marker, wherein the spectral marker is configured to emit a pre-defined light spectrum.

An image processing device includes circuitry. The circuitry is configured to process a background image into which a latent image is embedded, to obtain an effect to conceal the latent image. The circuitry is configured to perform color conversion of the background image to obtain a color-matching masking effect to conceal the latent image. The circuitry is configured to embed the latent image in the background image processed and converted, to generate an image embedded with the latent image.

A credential with one or more security features is disclosed. The disclosed credential includes a windowed security feature. The windowed security feature is taught to include a mirror element positioned in proximity with a transparent window and a first photo-luminescent feature positioned relative to the transparent window and the mirror element such that the mirror element enhances a luminescence of the first photo-luminescent feature when viewed and illuminated through the transparent window.

A method, system, and apparatus for rendering a security mark on a recording medium can involve creating a metameric pair of fluorescent inks with a first fluorescent ink among the metameric pair of fluorescent inks that blocks UV light and a second fluorescent ink among the metameric pair of fluorescent inks that does not block UV light, configuring at least one fluorescent ink among the metameric pair of fluorescent inks with a first pattern based on a constant pixel high surface and at least one other fluorescent ink among the metameric pair of fluorescent inks with a second pattern based on a substantial amount of white space, and defining a security mark for rendering on a recording medium with the metameric pair of fluorescent inks and based on the first pattern and the second pattern.