Why Coin Reactive Ink Is Actually Pretty Clever
If you've ever found yourself digging through your pockets for a nickel just to rub it against the back of a check, you've encountered coin reactive ink firsthand. It's one of those subtle security features that most of us don't think about until we actually need it. While we're all obsessed with high-tech digital encryption and biometric scanners these days, there's something oddly satisfying—and remarkably effective—about a security measure that requires nothing more than a bit of spare change to verify. ...