Infrared absorbing fine particle dispersed powder, dispersion liquid containing infrared absorbing fine particle dispersed powder, ink containing infrared absorbing fine particle dispersed powder, and anti-counterfeit ink, and anti-counterfeit printed matter

A method for producing infrared absorbing fine particle dispersed powder, comprising:

• mixing infrared absorbing fine particles, a surfactant and/or a coupling agent having at least one functional group selected from an amine-containing group, a hydroxyl group, a carboxyl group, or an epoxy group, and a solvent dissolving at least one resin selected from polyethylene resin, polypropylene resin, acrylic resin, polystyrene resin, polyisobutylene resin, epoxy resin, polyimide resin, ionomer resin, fluorine resin, urethane resin, ABS resin, polyvinyl alcohol resin, polyvinyl acetate resin, vinyl chloride resin, and vinylidene chloride resin, to obtain an infrared absorbing fine particle dispersion liquid having a dispersed particle size of the infrared absorbing fine particles of 1 nm or more and 800 nm or less, and thereafter removing the solvent from the infrared absorbing fine particle dispersion liquid to obtain an infrared absorbing fine particle dispersed powder.