Nano Manufacturing: Banknotes From Butterflies

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

Photograph by Grant Harder for

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Final Review

An engineer quality-checks the casting of a working master. Nano-fabrication engineers use a finished quartz wafer to carefully cast the security image onto a tough plastic sheet with a proprietary coating. This sheet can be used in the industrial scale production process as a master on either existing or developing currency.