Double-blind security features

A compound security feature is formed by printing latent images together with visually integrated settings using an invisible ink. Even if illuminated by a wavelength capable of rendering the inks visible, the latent images remain visually indistinguishable from their visually integrated settings. H...

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Bibliographische Detailangaben

Hauptverfasser:	Wicker, Thomas M, Wicker, David M, Caton, Michael Scott
Format:	Patent
Sprache:	eng
Online-Zugang:	Volltext bestellen
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