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.

Visible simple monochrome fibres

a — invisible (colorless) simple fibres; b —  UV light; 

c — two-colored simple fibres in white light; d —  UV light;