Many people know that paper money has markings that illuminate under a black light. These markings make it more difficult to counterfeit and thus easier to spot counterfeit money.
Also, regular paper glows wildly under a black light, while currency paper does not, another dead giveaway. The same also applies to credit cards.
For this demonstration, I rounded up one card from each of the major issuers and tore my basement apart looking for my standard issue college black light. I eventually found it, but only after creating a small pile of retro items for this year’s Halloween costume.
The black light’s strong purple glow catalyzed the American Express card to reveal “AMEX” spelled across the card, with a picture of a globe between “AM” and “EX.”
MasterCard was hiding “MC” on theirs:
The Visa card revealed the V logo.
This post originally appeared on Broken Secrets.
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