Amber mark passes the test, while a dark brown or black mark means the bill is suspect.
Works on all new design U.S. currency (1959 and later).
Highly effective and inexpensive tool for detecting bad bills. Simply make a small mark on U.S. currency. Chemically sensitive ink works instantly. An amber mark passes the test, while a dark brown or black mark fails, meaning the bill is likely counterfeit. Works on all new design U.S. currency (bills series 1959 and later).
Counterfeit Bill Detectors-Chem/Pen Counterfeit Bill Detectors
Counterfeit Bill Detector Type
Counterfeit Indication Mark
Black Dark Brown
Includes coil cable and self-adhesive clip.
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Counter Pen-Includes coil cable and self-adhesive clip.