FIELD: bindery.
SUBSTANCE: security paper contains a fibre substrate and at least one security thread integrated into the windows in this fibre substrate, wherein the fibre substrate has at least one region of variable opacity extending at least partially across a bridge of the fibre substrate that is situated between two, preferably successive, windows, along the security thread.
EFFECT: providing a security paper comprising a fibrous substrate and at least one embedded security thread in windows in the fibrous substrate the fibrous substrate having at least one region of variable opacity extending least partially on a bridge of the fibrous substrate between two windows, cut preferably along the at least one security thread.
43 cl, 28 dwg
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