| 摘要 |
<p>Systems and methods for document and product authentication using a variety of absorption and emission signatures are disclosed. Emission signatures in the form of florescent or phosphorescent coatings, inks and substrates are used for authentication and protection of items such as documents, currency, and secondary packaging for tobacco, luxury goods and pharmaceuticals. Spectrally overlapping absorption and emission materials are combined to provide a unique spectral fingerprint detectable by a scanner.</p> |
