| 摘要 |
Planchettes (2, 2', 2", 2"', 10, 20) for inclusion in paper products (22), such as bank notes, are described. The planchettes (2, 2', 2", 2 "',10, 20) comprise one or more coloured regions that are visible only under ultra-violet light. The planchettes have shapes (2, 2', 2", 2'", 10, 20) that are complex or have features such as indentations, projections and lobes. In some forms, the planchettes (2, 2', 2", 2"', 10, 20) form multi-sided symbols, such as national symbols. |
