1993-07-30 - money tracing

Header Data

From: Tyler Yip - UnixWeenie(tm) <davros@ecst.csuchico.edu>
To: cypherpunks@toad.com
Message Hash: 0d3212d2bda54299605d5d50fb5606b3b4953df50bce6c4931df90308e843629
Message ID: <9307302002.AA19091@hairball.ecst.csuchico.edu>
Reply To: N/A
UTC Datetime: 1993-07-30 20:04:52 UTC
Raw Date: Fri, 30 Jul 93 13:04:52 PDT

Raw message

From: Tyler Yip - UnixWeenie(tm) <davros@ecst.csuchico.edu>
Date: Fri, 30 Jul 93 13:04:52 PDT
To: cypherpunks@toad.com
Subject: money tracing
Message-ID: <9307302002.AA19091@hairball.ecst.csuchico.edu>
MIME-Version: 1.0
Content-Type: text/plain

since 1990, the Treasury has placed a nylon strip inside the paper of most of
the printed money ($10's and above, I believe).  This strip has letters on it,
spelling out "USA TWENTY" (for the $20 bill) such that it can only be seen if
light is passed through the note.  This was officially meant to prevent the
high quality scanners and color printers from being able to forge money, since
the scanner would not be able to reproduce the reflectively-invisible letters
in the strip.

Wonder if they could include such a technique in money tracking.
Has anyone ever checked the green ink on money for magnetic resonance?