Security device formed by printing with special effect inks

摘要: A security device is disclosed that has an image formed upon a substrate (1, 1b). The first printed region (3, 3b) and second different (2, 2b) both with same ink formulation of field alignable flakes (4b). At least one the regions 2b, 3, optically variable effects. One at partially surrounds other. thin parallel lines substantially wider than are in 2b). area density line group greater narrower lines. surprising effect this particles or (4b) aligned so as to produce visible kinematic dynamic not when tilted rotated.