| 摘要 |
<p>A system and a method for printing a secure document that is difficult to forge andreadily easy to visually verify are disclosed. The system includes a colorant forprinting an image on a surface of a document, a dye for forming a latent version ofthe image underneath the surface, a substrate, and a migration agent for facilitating themigration of the dye through at least a portion of the substrate. The migration agentmay be coated onto a portion of the substrate or embedded within the substrate. Anink may serve as the migration agent, in which case, the ink contains a solute forthe dye.</p> |
