| 摘要 |
A structure, in particular, a secure document such as a passport is provided. The structure includes a first layer (4) comprising a région of modified opacity (40), at least one additional layer (30; 6; 9) fixed relative to the first layer (4), and a luminescent agent (37) positioned relative to the at least one additional layer and the first layer such that upon excitation of the luminescent agent, light produced by the luminescent agent propagates through the first layer to become observable and render features of the région of modified opacity apparent. The région of modified opacity is not visible in light transmitted from any side of the structure. |
