FORGERY-PROOF PAPER

摘要

A forgery-proof paper comprises a base paper and small brilliant pieces disposed near the surface of the base paper and made by fragmenting paper coated with a coating liquid which is mainly composed of a nacreous pigment and a binder which is insoluble in cold water and soluble in hot water. Even if forgery is attempted reproduction on a color copying machine, a color of the small brilliant pieces mixed with the base paper cannot be reproduced, so that it is possible to readily discriminate between the real (an original) and the false (a duplicate). The small pieces are firmly bonded to the paper by the action of the binder without the possibility of falling away at the time of printing. In the case where the forgery proof paper is made waste paper, the small brilliant pieces will not adversely affect recovery of pulp. $$