INK FOR THE ENGRAVED STEEL DIE PRINTING PROCESS, METHOD FOR THE PRODUCTION AND USE THEREOF, SECURITY DOCUMENT CARRYING THE INK AND PROCESS OF MANUFACTURING A SECURITY DOCUMENT

摘要

Pasty ink for the engraved steel die printing process, having a viscosity value above 3 Pa.s, preferably above 5 Pa.s at 40 °C, and comprising an infrared absorbing material, wherein said infrared absorbing material is a transition element compound whose IR-absorption is a consequence of electronic transitions within the d-shell of transition element atoms or ions.