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  2. Security printing - Wikipedia

    en.wikipedia.org/wiki/Security_printing

    Simulated watermark. Printed with white ink, simulated watermarks have a different reflectance than the base paper and can be seen at an angle. Because the ink is white, it cannot be photocopied or scanned. [8] A similar effect can be achieved by iriodin varnish which creates reflections under certain viewing angles only and is transparent ...

  3. For position only - Wikipedia

    en.wikipedia.org/wiki/For_position_only

    Because of the risk that placeholder material might accidentally be published, it is clearly marked with an FPO indicator in the form of a simulated watermark or overprint, stamp, or the like in the expectation that it will make the placeholder's presence obvious to designers working on the layout; reviewing proof copies; or, as a last resort ...

  4. Printer tracking dots - Wikipedia

    en.wikipedia.org/wiki/Printer_tracking_dots

    Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...

  5. Security paper - Wikipedia

    en.wikipedia.org/wiki/Security_paper

    Barack Obama's birth certificate on security paper.. Security paper is a paper used in security printing that incorporates features that can be used 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.

  6. Void pantograph - Wikipedia

    en.wikipedia.org/wiki/Void_pantograph

    In security printing, void pantograph refers to a method of making copy-evident and tamper-resistant patterns in the background of a document. Normally these are invisible to the eye, but become obvious when the document is photocopied.

  7. EURion constellation - Wikipedia

    en.wikipedia.org/wiki/EURion_constellation

    The EURion constellation is made up of five rings. The EURion constellation (also known as Omron rings [1] or doughnuts [2]) is a pattern of symbols incorporated into a number of secure documents such as banknotes, cheques, and ownership title certificates designs worldwide since about 1996.