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Security thread

A strip of metallised biaxially-oriented PET film embedded in the paper substrate, alternating between visible (windowed) and embedded segments. May carry magnetic Fe3O4 coating and microprinted text. Detected by Raman (PET + Fe3O4 signature) and FTIR-ATR (PET ester bands).

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Related terms

Intaglio printingOptically variable ink (OVI)BandingBOPP (biaxially oriented polypropylene)Daisy wheelEuropol PEX (Project Ester)FICNFICN (Fake Indian Currency Notes)Fluorescent security inkGolf ball (IBM Selectric)GoniospectrophotometryMachine Identification Code (MIC)

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