| 摘要 |
A security document or device is provided which includes at least one area formed from a transparent plastics material which is exposed on at least one side to form a window or half-window, and a first colour shifting ink composition and a second colour shifting ink composition which both include different colour pigments and interference pigments but which both, at a first viewing angle, exhibit substantially the same colour when the interference pigments are viewable, and at other angles exhibit different colours when viewing the colour pigments. |
