| 摘要 |
The substrate (2) contains identifiable data and a security overprint (3) printed in fake-proof printing ink. The overprint consists of a two-colour field (3) one part (4) of which is printed with a printing ink such as fluorescent original ink, and the other part (5) is printed with an ink corresponding to a copied forgery. The field showing the overprint has a background in the form of a guilloche. |
