7 April 2000 Optically Variable Inks (OVI): versatility in formulation and usage
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Optically Variable Inks (OVI) are printing inks containing high precision, multi-layer interference filters as their constituent pigment. They display a strong and unique color change form a normal to an angled viewing position. During the last 10 years OVI has gained wide acceptance as an overt protection for numerous value documents including banknotes and ID cards. Meanwhile, continuous improvement has taken place over the last two years in a variety of areas.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pierre Degott, Pierre Degott, } "Optically Variable Inks (OVI): versatility in formulation and usage", Proc. SPIE 3973, Optical Security and Counterfeit Deterrence Techniques III, (7 April 2000); doi: 10.1117/12.382202; https://doi.org/10.1117/12.382202


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