I don't pay interest on my credit card. They make their money from making the vendor discount the price. Of course I pay in elevated prices eventually but that's not interest.
From your link...
Quote:
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The fast-moving ionised particles blasted copper atoms off the target. The atoms cooled down and condensed on the surface of a collecting device, producing a thin layer of sand.
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It may act like gold chemically, maybe even like gold electrically, but it sounds like with a thin coat it couldn't be used anywhere there's abrasion, like switches.