Security Fibres
Fine synthetic fibres that are added to the paper pulp during the manufacturing process. Security fibres can be found all over the document page or concentrated in a certain area. May luminesce in UV, IR light.
By visibility to the naked eye:
- visible / colored;
- invisible / colorless.
By color:
- monochrome;
- two-colored or multicolored with alternate fragments of various colors.
By form:
- simple threadlike security fibres with a constant cross-section;
- complex security fibres with a variable cross-section (ZONA security fibres developed by GOZNAK, Russia).
Fig. 1. Azerbaijan. Passport issued in 1998. Visible simple monochrome fibres
a
b
c
d
e
Fig. 2. Great Britain. Passport issued in 2010:
a — invisible (colorless) simple fibres; b — the same. UV light; c — two-colored simple fibres in white light; d — the same. UV light; e — security fibres concentrated in the area near the stitching thread on page 3
a
b
Fig. 3. Russian Federation. Passport issued in 2010:
a — ZONA security fibres, two-colored with a variable cross-section; b — the same. UV light
Fig. 4. Kosovo. Diplomatic passport issued in 2011. Page 17. Colorless simple security fibres luminescing in IR light