Secure Core Print (SCP)
An image (pattern, alphanumeric characters, etc.) located on the inner layer of a multilayer polycarbonate card. It is printed with special inks and visualized in transmitted light in the form of a dark image against a light-coloured background. SCP is also considered a pseudo watermark.
Fig. 1. Structure of a multilayer polymer card. Layer with Secure Core Print
a
b
c
Fig. 2. Latvia. Passport issued in 2015:
a — polymer substrate; b — the same. Transmitted light; c — the same. Zoomed fragment. Secure Core Print. Transmitted light
a
b
Fig. 3. New Zealand. Passport issued in 2016:
a — data page. Polymer substrate; b — the same. Secure Core Print in the form of a fern frond. Transmitted light (the image contours are marked with arrows)