Patent ID: 9566813
Date: 2017-02-14
CPC Classifications: B41M,B42D,B44F,Y10T

Claim:
1. A data carrier having a see-through portion, the see-through portion of the data carrier comprising at least one translucent layer security markings provided within the see-through portion and laser-engraved on the at least one translucent layer, a developer material provided within the see-through portion, changing an appearance of the security markings when read from a first side of the see-through portion under specific lighting conditions, and a filtering material provided within the see-through portion, at least partially filtering lighting radiations, such that the security markings have another appearance from a second side of the see-through portion opposite the first side, which is different from the appearance readable from the first side, wherein the security markings are located between the developer material and the filtering material.