Non-visualized information recording medium and apparatus for detecting the same.

摘要

An object of the present invention is to provide a non-visualized information recording medium for assuredly judging a specific document while reducing the cost. In order to achieve the foregoing object, according to the present invention, there is provided a non-visualized information recording medium having an identification mark formed by an ink containing a plurality of fluorescent coloring materials or fluorescent pigments, each of which has a fluorescent wave length in a near infrared region, and which have absorption spectrums having the maximum wave lengths that do not overlap each other.