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If it's just a simple additive with a detectable signature, then counterfeiters could obtain the same additive by grinding up real coins. Then they could apply
by FatalLogic 13y ago
If it's just a simple additive with a detectable signature, then counterfeiters could obtain the same additive by grinding up real coins. Then they could apply a layer of that material to the surface of their fakes.
So I think, as you suggest, they must (also) be using an anti-counterfeiting method that's more sophisticated than a plain additive. At least an additive that wouldn't return the same signature after it has been reprocessed by counterfeiters.
- darsham 13y agoThe problem is, when pressing the coins it might be difficult or impossible to apply such a layer properly. If the verification is done with a part of the electromagnetic spectrum that somewhat penetrates the coin, then you'll need a very thick, "obvious fake" layer. I am not a physicist so this is just vague speculation.