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Invisible QR codes tackle counterfeit bank notes

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Security printing of covert quick response codes using upconverting nanoparticle inks 
The published version of the paper “Security printing of covert quick response codes using upconverting nanoparticle inks” Jeevan M Meruga et al 2012 Nanotechnology 23 395201 is freely available online.

Nanotechnology
Nanotechnology encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects.

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