Droplet ejection ink, ink set, ink cartridge, droplet ejection apparatus, and recorded matter

摘要

Providing a recorded matter having a printable image that can be detected without using ultraviolet rays, and ink for discharging droplets, ink set, ink cartridge, and droplet discharge that can be suitably used for manufacturing the recorded matter Providing equipment. The ink for discharging droplets of the present invention is characterized by containing particles made of a material that emits up-conversion light. The average particle size of the particles is preferably 10 nm or more and 200 nm or less. The content of the particles in the ink for discharging droplets is preferably 0.1% by mass or more and 20% by mass or less. The ink for discharging droplets is preferably colorless. The particles are preferably composed of a material containing an inorganic substance.