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<p>[QUOTE=&quot;ValpoBeginner, post: 2441119, member: 77066&quot;]The only printing machines I&#039;m aware of that can produce color shifting ink is a 3D printer, and of course the U.S. B.E.P.&#039;s high tech machines.</p><p><br /></p><p>And weaving a security thread into paper made of cotton and linen + other secret ingredients is way too costly unless you are at the level of a nation state.&nbsp; Have you ever heard of North Korea&#039;s &quot;Super Notes&quot; (Dubbed as such by the media)?&nbsp; They are 100 dollar bills dated 2001 and 2003( not sure about the dates).... That have both color shifting ink and the security thread. Crazy right? </p><p><br /></p><p>&nbsp;I heard that these notes were produced and introduced into circulation in such high numbers that it is highly likely that several of the notes are still in circulation.&nbsp; I will have to do some research about how to detect these notes but I&#039;ll try to post some info on that here in the Paper Money forum, unless someone else already knows the answer to that.[/QUOTE]</p><p><br /></p>

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