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What is Security Paper?

Transcript Security Paper

Security paper is a paper that incorporates features that can act to identify or authenticate a document as original, e.g. watermarks or invisible fibres in paper, or features that demonstrate tamper evidence when fraud is attempted, e.g., to remove or alter print such as amounts or signatures on a cheque. The majority of this kind of papers are those used for identification such as certificates, such as birth certificates and different types of academic transcripts, as well as government documents, e.g. voting ballots and tax strips.

Various techniques exist to implement security paper, particularly for reducing copying. These include: Single or multi-tone watermarks, thus the same paper stock must be used in copies. A colored or patterned background, so erasures or alterations are visible. Dithered patterns, notably a finely dithered background (COPY ALERT message), which on original is largely indistinguishable from the rest of the background (due to having same overall density), but when copied becomes visible, due to either the scanner or the printer not being able to reproduce the required resolution (effectively a high frequency signal that is smeared out by copying). Thermo Chromatic (heat sensitive) inks that fade when rubbed. Microprinting. Phosphorescent fibres in the paper that can only be seen in UV-light, or fibres visible in daylight Metallised threads. (Prolonged) exposure to UV or oxygen causes a pattern to appear on the paper (e.g. to indicate expiry) Holographic images. Scratchable surface, e.g. on lottery scratchcards, to indicate when information has been revealed




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