chapter  38
14 Pages

## Detection of Counterfeit Currency and Turquoise

WithDonald A. Burns

Further Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 772 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 773

A near-infrared (NIR) spectrum can reveal information that counterfeiters don’t anticipate. As such, it can be used to detect fakes in those materials where the additional spectral information above the visible region differs from that in genuine materials. This chapter addresses efforts to thwart those who would print counterfeit currency or offer colored plastic to tourists seeking to purchase turquoise jewelry. Some of this work was done by the author during his tenure as a staff member at Los Alamos National Laboratory (LANL).