Abstract: The present disclosure provides a technology of obtaining a ceramic product including a decorative film which has a sufficient chemical resistance and can reduce damage during cleaning. A decorative composition disclosed herein contains at least a noble metal element and a glass matrix element. The glass matrix element contains a rare-earth element and a first element which is at least one selected from the group consisting of Si and Al. In the decorative composition disclosed herein, the content of the rare-earth element in the glass matrix element is from 1 mol % to 45 mol % inclusive, and the content of the first element in the glass matrix element is from 50 mol % to 90 mol % inclusive. This allows the decorative film having both alkali resistance and acid resistance at high level to be formed.

Abstract: A noble metal fine particle herein disclosed includes a noble metal element as a main constituent metal element. An imine compound is held on a surface, and an amine/imine ratio (A/I ratio) of an area ratio of a peak area of the imine compound and a peak area of an amine compound determined in pyrolysis GCMS analysis with a pyrolysis temperature of 300° C. is 1 or less.

Abstract: The manufacturing method provided by the present invention provides a powder material substantially comprising Ag—Pd core-shell particles consisting of Ag core particles containing silver as a principal constituent element and a Pd shell containing palladium as a principal constituent element covering at least part of the surface of the Ag core particles, wherein hydroquinone and/or a quinone is attached to the surface of the Ag—Pd core-shell particles. Typically, when the powder material is in a dispersed state in a specific medium, a Z average particle diameter (DDLS) based on the dynamic light scattering (DLS) method is 0.1 ?m to 2 ?m, and the polydispersity index (PDI) based on the dynamic light scattering method is 0.4 or lower.

Abstract: According to the present invention, provided is a method of producing silver nanoparticles including a mixing step of mixing a thermally decomposable silver compound, an amine compound having 5 or less carbon atoms, and a solvent including an organic solvent having a Log POW of 2.0 to 4.0 at a temperature at which the silver compound and the amine compound chemically react; a first heating step of heating a mixed liquid obtained in the mixing step to a first temperature lower than a decomposition temperature of the silver compound; and a second heating step of heating the mixed liquid containing nuclei of the silver nanoparticles to a second temperature equal to or higher than a decomposition temperature of the silver compound.

Abstract: The manufacturing method provided by the present invention provides a powder material substantially comprising Ag—Pd core-shell particles consisting of Ag core particles containing silver as a principal constituent element and a Pd shell containing palladium as a principal constituent element covering at least part of the surface of the Ag core particles, wherein hydroquinone and/or a quinone is attached to the surface of the Ag—Pd core-shell particles. Typically, when the powder material is in a dispersed state in a specific medium, a Z average particle diameter (DDLS) based on the dynamic light scattering (DLS) method is 0.1 ?m to 2 ?m, and the polydispersity index (PDI) based on the dynamic light scattering method is 0.4 or lower.