| 摘要 |
<p>A method for associating source information with a substrate includes providing at least two latent marking agent that emits a signal at different emission wavelength, wherein the signal is at least a potion of the source information; and raffixing at least two latent marking agents to the substrate. At least one latent marking agent includes an inorganic pigment. In some embodiments of the method, the latent marking agent must be exposed to ultraviolet radiation before it can emit a signal in response to infrared irradiation.</p> |
