A method, apparatus and system for analysing and authenticating a
luminescent tag are provided wherein a luminescence is triggered in the
tag and relative light intensities emitted thereby measured within at
least two luminescence bands. The measured intensities are compared with
at least one reference tag representative of relative intensities emitted
by an authentic tag to determine whether the luminescent tag corresponds
with any of the at least one reference tag. If the measured intensities
match the representative intensities, the luminescent tag is
authenticated. A computer program to be implemented by the apparatus and
system is also disclosed. Further, a method and system for verifying the
authenticity of one or plural objects are disclosed, wherein each of the
objects is to be associated with a respective tag. The respective tags
are coded to emit light, when triggered, within at least two luminescence
bands at respective predetermined relative light intensities. Having
access to a reference tag representative of the predetermined
intensities, the authenticity of a luminescent tag is verified by
measuring intensities emitted thereby within the luminescence bands and
comparing the measured intensities with the predetermined intensities.