| 摘要 |
The present invention relates to a multilayer structure (20), which is intended, in particular, to be integrated into a security document, comprising: at least one watermark (16) or pseudo-watermark; at least one diffusing layer (11), which is at least partially placed on top of the watermark or pseudo-watermark, the diffusing layer comprising a polymer matrix having a refractive index nmatrice, and diffusing particles bonded together by the matrix, having a refractive index nparticules that is different than that of the matrix, with a difference │nmatrice-nparticules│ that is greater than or equal to 0.01, and preferably greater than or equal to 0.03. |
