Transparent intaglio disappearing effect TIED
TIED – Transparent Intaglio Disappearing Effect
A combined security feature consisting of an image printed by intaglio onto the reflective metallic gold (or silver) patch. This combination creates a disappearing effect as the intaglio print is only visible at the angles of view, where the background is of high reflection. (fig. 1, b)
a
b
Fig. 1. TIED. 20 Singapore Dollars (2007):
a – view at right angles; b – at an acute angle