Via the New York Times, a pretty cool piece of science:
...Now Dr. Ortega and Fabiola Bravo Hualpa, a doctoral student, believe they have shed new light on the mystery of the coin that came from nowhere. In a paper published last year in the journal Heritage Science, they described how they subjected one of the two known 1899 dineros to a barrage of scientific analyses, illuminating its possible origins and the role it might have played during an unstable era of South American history.
To the naked eye, the 1899 coin resembles other dineros: It’s silver in color and features the same coat of arms and seated woman that represents the goddess of liberty. And it’s remarkably similar in size to other dineros minted around the turn of the 20th century — about the dimensions of a U.S. dime.
But when Dr. Ortega and Ms. Bravo Hualpa bombarded the 1899 coin with X-rays and measured the light it re-emitted, they determined that the dinero was largely made of copper, zinc and nickel. This alloy is known as nickel silver. It’s commonly used to make silverware and ornamental objects and has a silvery appearance, but it contains no silver. Genuine dineros produced by the Lima Mint, on the other hand, are roughly 90 percent silver....
Has there been a novel about a post-apocalyptic world where gold and silver come back, but there is a counterfeiting problem, but one lone chemist has a XRF gun and isn't afraid to use it?
I think Andy Weir should write that novel and I would definitely read it .
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