Varifeye Window

A hole in the paper covered by a transparent film (with liquid-crystal or other coatings) from one side of a banknote. Design features within the Varifeye change in contrast as a banknote is moved over a black or white background. There may also be a kinetic affect. The feature is produced during the manufacturing process of the paper substrate and has fibers forming a kind of fringe along the perimeter of the hole (fig. 1).

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