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<p>[QUOTE=&quot;gatzdon, post: 560722, member: 8247&quot;]The pens are useless and easily defeated.&nbsp; </p><p><br /></p><p>If someone needs to check notes on the fly, get a UV Penlight (they run about $60 to $70 shipped and are the size of a pen).&nbsp; The color on the security threads has a unique color under a UV light that is rarely duplicated in counterfeits because bank equipment doesn&#039;t check for it.</p><p><br /></p><p>I have a 1950 $20 bill that I got awhile back that was just abused by the pen.&nbsp; Today, the mark is almost completely gone.</p><p><br /></p><p>I imagine the determing factor the penmark to disappear completely is whether there was any foreign matter on the note for the pen to react with and turn black.[/QUOTE]</p><p><br /></p>

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