See-through Register

An image, a part of which is printed on one side of a banknote and the other part on the other side of a banknote. When the banknote is viewed against light, both parts match up and create a complete image. This can only be carried out on a simultaneous press and cannot be done on printing equipment used in usual polygraphy.

The image should not have any gaps or shifts and can only be seen in transmitted light (fig. 1, a–c).