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Optically variable ink (OVI)

An ink containing thin-film interference flakes (metal + dielectric layers, manufactured by SICPA and others) that produce a visible colour shift with viewing angle, used on denomination numerals of high-value notes including the Indian ₹500, US $100, EUR €50, and GBP £20.

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Intaglio printingBOPP (biaxially oriented polypropylene)Security threadBandingCotton-linen substrateDaisy wheelEuropol PEX (Project Ester)FICNFICN (Fake Indian Currency Notes)Fluorescent security inkGolf ball (IBM Selectric)Goniospectrophotometry

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