Abstract: A system and method create an authentication mark on a recording medium by depositing marking material on a medium in an image area to create a marking material image and to create a marking material authentication image. The marking material comprises an ultraviolet curable phase change ink composition comprising an optional colorant and a phase change ink vehicle comprising a radiation curable monomer or prepolymer; a photoinitiator; a reactive wax; and a gellant. A predetermined amount of additional marking material is further deposited upon the medium in the authentication image area to increase an amount of marking material associated with the marking material authentication image in the authentication image area.

Abstract: A method for embedding information on a substrate including converting information to machine readable code, wherein the code comprises a set of intended printed markings, wherein each intended printed marking of the set has a predetermined height on a substrate and represents a predetermined value, wherein intended printed markings having a same predetermined height represent a same data value, and wherein intended printed markings representing different data values have different heights; and printing the machine readable code on the substrate by depositing an ultra-violet curable phase change ink comprising an optional colorant and a phase change ink vehicle comprising a radiation curable monomer or prepolymer; a photoinitiator; a reactive wax; and a gellant and curing the deposited ink, such that each of the intended printed markings is formed as a printed marking with the predetermined height.

Abstract: An ink jet printing device including an ink jet print head and a print region surface toward which ink is jetted from the ink jet print head, wherein a height distance between the ink jet print head and the print region surface is adjustable; wherein the ink jet print head jets an ultra-violet curable phase change ink composition comprising an optional colorant and a phase change ink vehicle comprising a radiation curable monomer, or prepolymer; a photoinitiator; a reactive wax; and a gellant; wherein a print deposited upon the print region surface is Braille, raised print, or a combination of regular print and one or both of Braille and raised print.

Abstract: A method for fabricating a three-dimensional object including depositing a first amount of an ultraviolet curable phase change ink composition comprising an optional colorant and a phase change ink vehicle comprising a radiation curable monomer or prepolymer; a photoinitiator; a reactive wax; and a gellant upon a print region surface; successively depositing additional amounts of the ultraviolet curable phase change ink composition to create a three-dimensional object; and curing the ultraviolet curable phase change ink composition.

Abstract: A method of controlling gloss of an image includes forming an image over a substrate by applying a colored or colorless composition, included a colored ink and/or a colorless overcoat composition, over one or more portions of the substrate, wherein the colored or colorless composition includes at least one gellant, at least one curable monomer, at least one curable wax and optionally at least one photoinitiator, wherein the colored or colorless composition is curable upon exposure to radiation, and curing the colored or colorless composition following application by applying radiation to the colored or colorless composition and, during the curing, controlling an amount of oxygen present in an atmosphere around the image.

Abstract: A method of controlling gloss of an image includes determining a desired gloss of an image; in an overcoat composition of at least one gellant, at least one curable monomer, at least one curable wax and optionally at least one photoinitiator, wherein the overcoat composition is curable upon exposure to radiation, setting the amount of at least one curable wax to include in the overcoat composition based on the determined desired gloss; preparing the overcoat composition to contain the set amount of the at least one curable wax; applying the overcoat composition over a substrate; and applying radiation to substantially cure the overcoat composition.

Abstract: A method of forming bimetallic core-shell metal nanoparticles including a core of a first metal material and a shell of a second metal material, the method including photochemically producing metallic nanoparticle cores of the first metal material, and forming a shell of the second metal material around the cores. The shell can be formed by adding shell-forming precursor materials to a solution or suspension of the cores and photochemically forming the shells around the cores, or by separately photochemically producing metallic nanoparticles of the second metal material and mixing the metallic nanoparticles of the second metal material and the metallic nanoparticle cores to cause the metallic nanoparticles of the second metal material to form a shell around the metallic nanoparticle cores.

Abstract: A method of forming an ink, including photochemically producing stabilized metallic nanoparticles and formulating the nanoparticles into an ink.

Abstract: A substantially colorless radiation overcoat composition suitable for overcoating ink-based images and xerographic-based images. The overcoat composition comprises at least one gellant, at least one monomer, at least one substantially non-yellowing photoinitiator, optionally a curable wax, and optionally a surfactant.

Abstract: An ink compatibility including a dye and surface functionalized photocatalytically active semiconductor nanoparticles is provided. This ink composition enables the reuse of a print substrate, because the surface functionalized photocatalytically active semiconductor nanoparticles bleach the dye under an activating radiation.

Abstract: Core-shell nanoscale pigment particles include a core organic pigment composition including nanoscale particles of organic pigments, and a shell layer of surface-deposited silica, where the organic pigment particles are selected from azo-type pigment particles, azo laked pigment particles, quinacridone pigment particles, phthalocyanine pigment particles, and mixtures thereof. The core-shell nanoscale pigment particles can also include an organic primer layer covering the core and located between the core and the shell layer. The core-shell nanoscale pigment particles can be made by preparing a core composition including nanoparticles of organic pigments, and encapsulating the core with shell layer of surface-deposited silica and an optional organic primer layer located between the core and the shell layer.