| 摘要 |
FIELD: important documents. ^ SUBSTANCE: document has at least one material with optically alternating properties forming different color effects when observing at different observation angles. Also document has at least one identifying substance subject to automatic control or recognition, which does not worsen optically discernible alternating effect formed by material with optically alternating properties. Identifying substance is present in form of code or symbolic information, and material with optically alternating properties is a pigment or particle of acceptable size and shape coefficient. ^ EFFECT: higher reliability. ^ 8 cl, 10 dwg |
