The specially formulated ink in the Sharpie Conterfeit Detector is a safeguard you can see. Simply mark on paper currency and yellow marks indicate good and a black mark indicated conterfeit bills.
Sold by the each. Master case pack is 144 (12 boxes of 12)
This is the cone-tipped bright assortment water-based version. Set contains: battery charged blue, blue lagoon, electric lime, hot pink, infra red, laser lemon, primrose, sea foam green, teal, and tropical violet. AP Certified nontoxic..