Pack of 5 G-Star Technology Counterfeit Detector Pen Marker Set

The ink in this pen marker is designed to react to the unique chemical compound present in the US bills The pen marker is 5.25" long, the blister pack measures 10" X 4.5" X 0.5" The ink stays yellow on genuine bills and changes to dark color on counterfeit bills

The ink will disappear in a few hours The G-Star Technology counterfeit bill detection pen marker contains inks that are formulated to react to the unique chemical compound that is on the US bills, new and old.The ink will stay in yellow color on genuine bills, but will change to dark color on counterfeit bills/banknotes.The ink will disappear in a few hours.