Security Thread

A narrow polymer or metallic stripe embedded in a paper web during the paper manufacturing process. It is verified in transmitted light.

Types of security threads:

  • a latent security thread is completely embedded in paper;
  • a windowed (diving) security thread appears partially on the paper surface. In reflected light it looks like a dashed line, in transmitted light — like a solid dark stripe.

Security threads may be colored and may incorporate microprinting, optically variable, UV and IR luminescent features.

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