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OVI (Optically Variable Ink)
OVI (Optically Variable Ink)
Printing ink containing optically variable pigments which show large colour shifts (strong variations in colour) depending on the angle of observation or lighting. Optically variable inks consist of multi-layered micro flakes in a transparent ink medium. The pigment flakes are microscopic waveband-selecting optical devices (interference filters). OVIs are used in intaglio printing or in screen printing.







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