TAMPER EVIDENT OPTICALLY VARIABLE DEVICE AND ARTICLE UTILIZING THE SAME

摘要

This disclosure relates to a tamper evident optically variable device (26) comprising an optically variable device having at least first and second layers (56, 61) with a spacer layer (59) therebetween providing a colour shift with change in viewing angle. A release layer (62) is disposed between the first and second layers to permit the first and second layers to be separated from each other and thereby to destroy the optical shifting properties of the optically variable device once separation has occurred. The device may be embodied in the overlapping flaps (19, 21) at the top of a cardboard container (12) for a bottle (13). Other embodiments are disclosed in which the dence is incorporated in the screw top of a bottle.