Demetallization
The process when text or design elements are removed from the metallic layer by a laser or chemical erasure and become visible when viewing in transmitted light.
a
b
c
Fig. 1. Great Britain. Passport issued in 2015:
a — data page. Paper substrate; b — the same. Number made by foil demetallization. Transmitted light; c — the same. Zoomed fragment
a
b
c
d
Fig. 2. Russian Federation. Passport issued in 2010:
a — data page. Polymer substrate. The Blik security element is marked with a frame; b — the same. View at a right angle of observation and illumination to the document surface. The image on the background is printed in red ink (offset). It is visible through demetallized areas; c — the same. View at an angle of 45°. Holder's portrait; d — the same. Zoomed fragment. The anti-copy pattern and the image are visible through the demetallized areas