Nano Manufacturing: Banknotes From Butterflies

By Amelia Hennighausen - 2013-09-23T13:23:07Z

Photograph by Grant Harder for Bloomberg.com

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Safety in Currency

Nanotech Security’s anti-counterfeiting authentication technology is shown here on a mocked-up banknote using the company's  proprietary KolourOptik system. The security image of the totem on the right is not actually printed. It involves no dyes, inks or pigments, but rather structured holes that use ambient light to show color — “printing” for the 21st Century.

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