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<p>[QUOTE=&quot;Numbers, post: 2626154, member: 11668&quot;]I don&#039;t know a precise date, but doing a quick Google search for &quot;missing magnetic ink&quot; errors, <a href="https://currency.ha.com/itm/error-notes/fr-2076-g-20-1988a-federal-reserve-note-pcgs-gem-new-66ppq/a/3505-14290.s?ic4=ListView-ShortDescription-071515" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://currency.ha.com/itm/error-notes/fr-2076-g-20-1988a-federal-reserve-note-pcgs-gem-new-66ppq/a/3505-14290.s?ic4=ListView-ShortDescription-071515" rel="nofollow">the oldest example I could turn up was Series 1988A</a>.&nbsp; So my guess would be that the use of the magnetic ink started around then.</p><p><br /></p><p>For those who hadn&#039;t heard of this: the black intaglio printing on the face of each note is actually done with two different black inks, one of which is magnetic.&nbsp; The two black inks are applied in a different pattern on each denomination.&nbsp; This provides a way for any machine that processes currency to verify the denomination of a note (and to reject counterfeits produced by people who didn&#039;t bother to duplicate the magnetic ink patterns).</p><p><br /></p><p>In a similar way, the green intaglio printing on the back of each note is done with two different green inks, one of which is invisible under infrared light.&nbsp; Again, the special infrared ink is used in a different location on each denomination, providing another way to verify a note.&nbsp; I&#039;m pretty sure the IR ink is a newer feature than the magnetic ink; if I remember correctly, even some of the big-head notes don&#039;t have it.&nbsp; But again I don&#039;t know an exact date for its introduction.[/QUOTE]</p><p><br /></p>

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