PURPOSE: To effectively prevent a forgery, a falsification without being restricted in a design of a medium by recording invisible information such as characters, numeric characters, a bar coder, etc., by a thermal head, a laser beam, direct writing, etc., and reading its information itself, though it is invisible, by a machine.

CONSTITUTION: A thermal and pressure-sensitive record layer 2 containing dye precursor having remarkable light absorption on an IR region without almost altering absorption of a visible region when in contact with an electron accepting substance is provided on at least one side of a support, a decorative print layer 3 such as characters, ground ting, etc., of ink for absorbing a light of a visible region and transmitting a light of an IR region is provided on the layer 2 as required, and further heat resistant protective layers 4 are provided on the players 2 and 3 as required.