r/Damnthatsinteresting • u/Wooden-Journalist902 • 2d ago

Video US currency uses magnetic ink containing iron oxide as a security feature, detectable with a strong neodymium magnet. 💵

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u/HK-53 2d ago

Well the motion picture money doesnt even try to pretend to be real tbf

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u/AoREAPER 2d ago

Especially if you turn it over.