| abstract |
A printed matter (100) comprising a substrate (10) and a first information code on the substrate (10), wherein the first information code is composed of an infrared-absorbing ink layer (11) on which infrared-absorbing ink has been printed ) structure, in the infrared absorbing ink layer (11), with respect to the laminate composed of the substrate for measurement and the infrared absorbing ink layer for measurement on the substrate for measurement, the substrate for measurement is used as a reference (reflectance 100%), when measuring the relative spectral reflectance from the side of the infrared absorbing ink layer for measurement, the minimum relative reflectance in the visible region is 50% or more, and the minimum relative reflectance in the infrared region is 75% or less, so The substrate for measurement is formed of the same material as the substrate (10), and the infrared-absorbing ink layer for measurement is formed of the same material as the infrared-absorbing ink layer (11). |