Unbelievable Tech Info : Scientists Create Invisible Nano Barcode

Now, here is a
new research that adds an extra layer of
security over existing methods in the fight
against fake banknotes and counterfeiting.
Scientists at the University of South Dakota
and South Dakota School of Mines and
Technology have developed an invisible version
of square modern barcodes using nanoparticles
and fluorescent ink. It is interesting to note
here that the invisible QR (quick response) code
can only be seen under laser light.
The researchers have come up with an
innovative way to print blocks of black and
white QR codes (common in marketing) with
inks that are only visible when illuminated with a near-infrared laser.

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Scientists Create Invisible Nano Barcode