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Windowed security thread

A polymer strip embedded in the substrate that alternates between being below the surface (visible as a dark stripe in transmitted light) and emerging through windows (visible as a metallic segmented band in reflected light).

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Related terms

BOPP (biaxially oriented polypropylene)Cotton-linen substrateIntaglio printingKINEGRAMLatent imageMicroprinting / microtextMulti-tone watermarkOptically variable ink (OVI)See-through register

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