LOOKING FOR DISAPPEARING INK FORMULATIONS/REFERENCES

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1 total messages Started by William R. Bishop Thu, 29 Oct 1992 03:34

#13

Author: William R. Bishop
Date: Thu, 29 Oct 1992 03:34

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  I hope this is the right group for this request - 
A friend of mine is looking for disappearing inks for a security issue. Does
anyone know of any formulas and/or refs (or even where to look)?  The Japanese
have a patent for an ink that disappears when you try to copy it and
then reappears when the "bright light" goes out (#8553981), but I need 
something more permanent.  I havn't been successful tracking down leads - 

                   Thanks in advance, Bill -<wrb@wrb.com>

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