Why It Is About to Get a Lot More Difficult to Produce Counterfeit Cash [Money]

Why It Is About to Get a Lot More Difficult to Produce Counterfeit Cash [Money]:

A team of scientists led by Jon Kellar at the South Dakota School of Mines and Technology have come up with a special QR code—using nanoparticles combined with blue and green fluorescent ink—that can be used to prevent counterfeiters from getting away with passing along forged cash. More »