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Epoxy Bumps
The USA has a distinguished history of inventing
inexpensive paper currency features to defeat
counterfeiters, including embedded plastic strips and
special thick ink that changes color depending on the
angle of incidence of the illumination.
One feature that could be added to paper money is nonbraille
catalyzed or thermoset epoxy resin bumps bonded into the paper.
This feature would be difficult for counterfeiters to duplicate
(cheap plastic dots would scrape right off), yet would be far less
expensive up and down the line than size changes, since printing
and handling systems would need only minimal changes.
Note: Many low molecular weight catalyzers and/or resins involved
in epoxy systems
cause contact dermatitis (skin
allergy reaction) in some people. Because of this problem,
only high molecular weight nonallergenic epoxy resin
systems should be used.
The U.S. Department of Engraving and Printing is entirely capable
of developing effective nonbraille epoxy dot systems, but they
might not think of it on their own. OurMoneyToo.org would like to
suggest it in addition to the existing alternatives, since it may
actually be better than the others. It is certainly better than
the raised numerals mentioned in the recent court ruling, which
most people cannot easily read by touch. Also, ordinary raised
numerals and bumps would not remain intact over time the way epoxy
bumps would.
Important Note: It would be a bad idea to put standard braille on paper money.
Many blind and visually impaired people have not had the opportunity
to learn braille. Another reason that braille is a poor choice is that
many people who are blind due to diseases that cause peripheral nerve damage,
such as diabetes, cannot distinguish dots in the standard braille spacing.
Finally, note that unless advanced technologies such as
embedded epoxy bumps
are used, raised bumps tend to rub out quickly.
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