METAL MICROPARTICLE, COMPOSITION CONTAINING THE SAME AND PROCESS FOR PRODUCING METAL MICROPARTICLE

摘要

Metal microparticles that exhibit selective wavelength absorption capability over a wavelength region from visible light to near infrared light, having sharp light absorption characteristics and that have less influence on ambient wavelengths, realizing color tone of high saturation. There are provided metal microparticles characterized in that the aspect ratio thereof is in the range of 1.1 to 8.0, the maximum absorption wavelength of plasmon absorption in the range of 400 to 1,200 nm and the absorptivity at maximum absorption wavelength peak position in the range of 6,000 to 20, 000 L/mol.cm (measurement concentration: 1.6x10-4 mol/L and solvent: water).