Patent ID: 7800088
Filing Date: 2010-09-21
Classification: C09D

Abstract:
1. A method of identifying a source of a substance incorporating one or more luminescent markers, each of the one or more luminescent markers comprising a glass with one or more rare earth elements, the method comprising: illuminating the substance to stimulate luminescent emission from at least one of the one or more luminescent markers; detecting the stimulated luminescent emission; generating a luminescent signature based on one or more aspects of the detected luminescent emission, wherein the aspects of the detected luminescent emission comprise a rate of change of emission versus time and a rate of change of emission versus wavelength; comparing the generated luminescent signature with one or more pre-defined luminescent signatures, the one or more pre-defined luminescent signatures being associated with information which identifies the source of the substance; and identifying the source of the substance based on a match between the generated luminescent signature and one of the one or more pre-defined luminescent signatures.