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Appendix B: Features of Current U.S. Banknotes
Pages 54-59

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From page 54...
... The section on the vulnerability of current features describes some methods being used to simulate genuine banknote features. CREATING UNIQUE FEATURES ON GENUINE BANKNOTES Special papermaking and printing processes are required in the manufacture of U.S.
From page 55...
... The degree of polymerization of these chains ranges from 15,000 for unprocessed cotton to as low as 1,000 in a bleached kraft pulp. The hydroxyl groups on these linear cellulose chains form strong hydrogen bonding networks within and between cellulose chains.
From page 56...
... The watermark depicts the same historical figure as that shown on the respective bills' engraved portraits. Higher-denomination notes also incorporate security strips, made of thin plastic embedded in the notes in the final stages of papermaking; these are marked by metallic print indicating the denomination of each note.
From page 57...
... · The features most used by current machine readers are the transmissive optical spectrum and printed image, magnetic patterns, ultraviolet fluorescence, ultraviolet spectrum, and the infrared properties. Low-end readers may sense only one feature; high-end readers may use 10 or more measurements to authenticate and denominate each note.
From page 58...
... However, even if a counterfeiter makes no attempt to simulate the more difficult features, an uneducated public can facilitate their quick financial gain. A larger threat is looming as well: the increasing availability of currency-accepting devices that remove the human cash handler from the transaction.
From page 59...
... Finally, novel methods of using image-acquisition and image-processing software can more easily simulate the features on banknotes. For example, instead of scanning an entire note and re-creating it line by line, the tools common to today's art software can enable a would-be counterfeiter to scan and edit features independently.

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