These questions are almost going to be left unanswered because of the level of difficulty and lack of numisatic material. If you can answer any...
Hello Satootoko and the rest :D The most common one that Roy and I would know is the instance of Japanese 1 yen coins that circulated in...
Sorry, PVC damaging gold coins is true. Pure gold does tarnish or "melt" under extreme conditions if you aren't careful enough. And here is a...
Alternatively you can do gold plating. The idea is that you melt the gold in an acid which becomes a gold solution. This can be applied on any...
Russia (or the Soviet Union) and Malaysia tried to do that before but failed miserably. The main reason of the failure is because gold prices are...
LOL @ asking in a physics channel. Why not in a geochemistry forum? LOL
LOL this is too funny. Haven't you heard of something called Moh's hardness scale? Gold's hardness is around 2.5 and copper is around 3.0. We all...
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