Patent ID: 8226125
Filing Date: 2012-07-24
Classification: B42D

Abstract:
1. A security document having a first region and an adjacent second region, the regions defining a security device wherein opposite sides of the first region are provided with first and second, complementary indicia registered with respect to one another, the first region being sufficiently transparent that both the first and second indicia are viewable from either side of the document under reflected light, wherein third indicia are provided on the second region on the same side of the document, registered with, and complementary to, the first indicia, and wherein fourth indicia are provided on the second region on the same side of the document, registered with, and complementary to, the second indicia, the third and fourth indicia also being complementary to and registered with respect to one another, the second region being sufficiently opaque such that when the document is viewed under reflected light only the third or fourth indicia facing the observer are visible, but being sufficiently transparent that when the document is viewed from either side under transmitted light, both the third and fourth indicia are visible.