| abstract |
A paired optically variable device comprises a substrate having a first surface (18), first and second optical devices (23, 24) carried by the first surface of the substrate in spaced-apart positions on the first surface of the substrate to permit viewing at the same time by a human eye. A first optically variable pigment (21) is disposed in the first optical device, and a second pigment (22) is disposed in the second optical device. The optical devices have the same color at one angle of incidence and have colors different from each other at all other angles of incidence. |