Security markers for determining composition of a medium

Gary A. Ross (Inventor), Graham I. Johnson (Inventor), Barrie Clark (Inventor), Simon J. Forrest (Inventor), Jeffrey Cegalis (Inventor), William J. Greaves (Inventor), Charles Q. Maney (Inventor)

Research output: Patent


A method of determining a component of a medium comprises illuminating the medium to excite a marker associated with the component. Detected photoluminescent emission from the marker in response to the excitation is compared with one or more emission profiles. The component is identified based on a match between the detected photoluminescent emission and at least one of the emission profiles.
Original languageEnglish
Patent numberUS 7,256,398 B2
Filing date2/11/05
Publication statusPublished - 14 Aug 2007
Externally publishedYes


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