WATERMARKED PRINTING MEDIUM FOR FORGERY PREVENTION

摘要

A watermarked printing medium for forgery prevention which comprises a core sheet, cover sheets disposed on both sides of the core sheet, and a printed layer disposed on at least one surface of the core sheet and formed from an ink containing an antimony-doped tin oxide pigment, wherein the printed layer cannot be recognized by means of reflection of visible light but can be recognized by means of transmitted visible light or under irradiation with infrared rays.