Lifetime studies of security inks using a novel gonio-spectrometer with in situ aging capability

Markus Emerich; Erwin Rosenberg; Harald Deinhammer; Susanne Paleczek; Peter Fajmann; Daniel Schwarzbach

doi:10.1117/12.527719

3 June 2004 Lifetime studies of security inks using a novel gonio-spectrometer with in situ aging capability

Markus Emerich, Erwin Rosenberg, Harald Deinhammer, Susanne Paleczek, Peter Fajmann, Daniel Schwarzbach

Proceedings Volume 5310, Optical Security and Counterfeit Deterrence Techniques V; (2004) https://doi.org/10.1117/12.527719
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

Abstract

The state of the art in manufacturing security documents includes the usage of a multitude of inks and pigments. The chemical and physical stability of these materials is a crucial point for their application in long lasting security products such as banknotes. For our studies regarding the bleaching characteristics of pigments and inks we have developed a highly integrated double beam gonio-spectrometer with in-situ ageing capability. The new spectrometer is equipped with a stabilized solar simulator lamp featuring a dosimeter, which is an advanced alternative to the commonly used blue wool scale. Additionally the sample temperature can be stabilized during ageing tests by a thermostatted sample holder. The instrument is capable of performing reflection measurements using monochromatic and polychromatic excitation and further allows fluorescence, phosphorescence and polarization measurements with high resolution over a wide wavelength range. We will present first results of defined ageing tests on a variety of security pigments and the setup of the newly developed spectrometer.

Citation Download Citation

Markus Emerich, Erwin Rosenberg, Harald Deinhammer, Susanne Paleczek, Peter Fajmann, and Daniel Schwarzbach "Lifetime studies of security inks using a novel gonio-spectrometer with in situ aging capability", Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); https://doi.org/10.1117/12.527719

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