| 摘要 |
The invention relates to security paper ( 1 ) including at least one zone ( 2; 3 ) that reacts with nonpolar solvents. The paper also includes a barrier ( 4 ) that is impermeable to nonpolar solvents between a first outside face ( 10 ) of the security paper and the zone ( 2; 3 ) that reacts with the solvents. |
