| 摘要 |
<p>This invention relates to an unfalsifiable safety paper comprising on its surface and/or in its mass, at least one compound responding to formula: <IMAGE> (I) in which: R corresponds to hydrogen, to an alkyl group of C1 to C8, substituted or not, to a non-substituted, N-substituted or N,N-substituted amine group, to NO2, to a halogen; n is equal to 0 or 1. The invention is applicable to handwritten pieces for payment.</p> |
