An inkjet ink contains a pigment, a pigment dispersion resin, a water-soluble organic solvent, and a polymer nonionic surfactant. The pigment dispersion resin has an acid value of at least 55 mgKOH/g and no greater than 97 mgKOH/g. The polymer nonionic surfactant has a mass average molecular weight of at least 7,000 and no greater than 12,500. An inkjet recording apparatus includes a linehead and a conveyance section which conveys a recording medium. The linehead ejects the above inkjet ink onto the recording medium.

A pigmented aqueous inkjet ink set for manufacturing decorative panels includes a cyan aqueous inkjet ink containing a copper phthalocyanine pigment; a red aqueous inkjet ink containing a red pigment selected from the group consisting of C.I. Pigment Red 254, C.I. Pigment Red 122, C.I. Pigment Red 176 and mixed crystals thereof; a yellow aqueous inkjet ink containing a pigment C.I Pigment Yellow 150 or a mixed crystal thereof; and a black aqueous inkjet ink containing a carbon black pigment, wherein the aqueous inkjet inks contain a surfactant. An inkjet printing method for manufacturing decorative panels is also disclosed.

A pigmented aqueous inkjet ink set for manufacturing decorative panels includes a cyan aqueous inkjet ink containing a copper phthalocyanine pigment; a red aqueous inkjet ink containing a red pigment selected from the group consisting of C.I. Pigment Red 254, C.I. Pigment Red 122, C.I. Pigment Red 176 and mixed crystals thereof; a yellow aqueous inkjet ink containing a pigment C.I Pigment Yellow 150 or a mixed crystal thereof; and a black aqueous inkjet ink containing a carbon black pigment, wherein the aqueous inkjet inks contain a surfactant. An inkjet printing method for manufacturing decorative panels is also disclosed.

A method of forming a security device includes selectively providing a high refractive index (HRI) layer to a first outwardly facing surface of a security device substrate, the HRI layer having a substantially transparent host material and particles having a dimension along at least one axis less than 200 nm, such that they are substantially non-scattering to visible light and the HRI layer is substantially transparent to visible light, and wherein; the particles have a refractive index of at least 1.8 and are present within the host material in a proportion such that the resultant refractive index of the HRI layer is at least 1.6. A corresponding security device, as well as security articles and security documents, are also disclosed.

A method of forming a security device includes selectively providing a high refractive index (HRI) layer to a first outwardly facing surface of a security device substrate, the HRI layer having a substantially transparent host material and particles having a dimension along at least one axis less than 200 nm, such that they are substantially non-scattering to visible light and the HRI layer is substantially transparent to visible light, and wherein; the particles have a refractive index of at least 1.8 and are present within the host material in a proportion such that the resultant refractive index of the HRI layer is at least 1.6. A corresponding security device, as well as security articles and security documents, are also disclosed.

A white ink can include an aqueous ink vehicle, from 5 wt % to 25 wt % of white metal oxide pigment having an alumina coating, a dispersant associated with a surface of the white metal oxide pigment, and from 0.05 wt % to 0.5 wt % of amphoteric alumina particles having an average particles size from 2 nm to less than less than 100 nm. The white ink can further include from 0.3 wt % to 1.1 wt % monovalent metal salt, or from 0.005 wt % to 0.175 wt % divalent metal salt, or both.

A white ink can include an aqueous ink vehicle, from 5 wt % to 25 wt % of white metal oxide pigment having an alumina coating, a dispersant associated with a surface of the white metal oxide pigment, and from 0.05 wt % to 0.5 wt % of amphoteric alumina particles having an average particles size from 2 nm to less than less than 100 nm. The white ink can further include from 0.3 wt % to 1.1 wt % monovalent metal salt, or from 0.005 wt % to 0.175 wt % divalent metal salt, or both.

Ceramic ink for digital printing comprising a solid part provided with at least one ceramic component and a liquid part provided with at least one first vehicle, wherein said first vehicle is selected from the group comprising: esterified terephthalates, cyclohexane dicarboxylates, citrates, trimethylolpropane esters, fatty acid esters of aromatic alcohols.

Ceramic ink for digital printing comprising a solid part provided with at least one ceramic component and a liquid part provided with at least one first vehicle, wherein said first vehicle is selected from the group comprising: esterified terephthalates, cyclohexane dicarboxylates, citrates, trimethylolpropane esters, fatty acid esters of aromatic alcohols.

Disclosed herein are ink compositions for making a conductive palladium structure. For example, the ink composition can comprise a palladium salt and a complex of a complexing agent and a short chain carboxylic acid or salt thereof. In some embodiments, a second or third metal salt is included in the compositions. Also disclosed herein are methods for making and using such conductive ink compositions.