| 摘要 |
Disclosed are security articles and methods and systems for authenticating security articles using a plurality of stimuli. According to one embodiment, an illustrative security feature includes activation of phosphorescent or fluorescent materials by the simultaneous presence of a source of electromagnetic radiation and a specific gas environment. A detector detects a spectral emission of the security feature that results from the change in gas environment. The spectral emission may be compared to an expected emissive signature to determine authenticity of the security article. |
