SECURITY PAPER; LAMINATED PAPER INCLUDING A RESINOUS SUBSTRATE SHEET ON WHICH INDICIA ARE PRINTED, INDICIA UNDETECTABLE IN REFLECTED LIGHT BUT VISIBLE IN TRANSMITTED LIGHT

摘要

Security paper comprising a central resinous substrate sheet carrying indicia on one face, with paper sheets permanently laminated to both faces such that the indicia are substantially undetectable when viewed in reflected light and are apparent through the paper sheets when viewed by transmitted light within the visible spectrum.