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magnetic ink

British  

noun

  1. ink containing particles of a magnetic material used for printing characters for magnetic character recognition

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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If a fabric or device printed with this magnetic ink breaks, the particles attract one another and close the gap.

From New York Times

Hi-tech magnetic ink allows counting machines at banks to instantly sort the authentic cash from the fake bills.

From The Guardian