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  2. Tamper-evident technology - Wikipedia

    en.wikipedia.org/wiki/Tamper-evident_technology

    The impact from a postmarking machine then leaves a UV-visible mark as well as an ink mark which identifies attempts to reuse stamps. In a similar vein, asset-numbering labels on corporate equipment (PCs and the like) are often designed to leave an imprint of either the serial number, or the word "VOID" if the label is peeled off.

  3. Permanent marker - Wikipedia

    en.wikipedia.org/wiki/Permanent_marker

    Permanent markers are used for writing on metals, plastics, ceramics, wood, stone, cardboard etc. However, the mark made by them is semi-permanent on some surfaces. Most permanent marker ink can be erased from some plastic surfaces (like polypropylene and teflon) with little rubbing pressure. They can be used on ordinary paper, but the ink ...

  4. Security printing - Wikipedia

    en.wikipedia.org/wiki/Security_printing

    Security printing is the field of the printing industry that deals with the printing of items such as banknotes, cheques, passports, tamper-evident labels, security tapes, product authentication, stock certificates, postage stamps, and identity cards.

  5. Direct part marking - Wikipedia

    en.wikipedia.org/wiki/Direct_Part_Marking

    Liquid metal jet Stencil (mechanical cut, photo process, laser cut) Other methods like manual metal stamp, vibro-etch and embossing were not suitable to successfully apply micro size (1/32- to 15/64-inch square), high density machine-readable symbols.

  6. UV marker - Wikipedia

    en.wikipedia.org/wiki/UV_Marker

    UV marker with UV led lamp. An ultraviolet (UV) marker is a pen whose marks are fluorescent but transparent; the marks can be seen only under an ultraviolet light.They are commonly used in security situations to identify belongings or to prevent the reproduction of unauthorized banknotes.

  7. Rapiscan Systems - Wikipedia

    en.wikipedia.org/wiki/Rapiscan_Systems

    Rapiscan Metor walk-through metal detectors stem originally from Outokumpu, which was one of the first companies to develop walk-through metal detectors for security screening. The systems were originally adapted from metal detectors used in the mining industry to locate parts of broken drill bits in minerals on a conveyor belt. [ 5 ]

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