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Much cheaper to stock up on fake gold and bank on the fact that nobody else remembered to stock up on aqua regia.


They could do a density test with water if there are concerns about whether a substance is really gold.


Acid test, teeth indentation, maliablity (sp).


Those are things you do to gold, not with gold. How would they help?


Those are ( along with other OP’s suggestion of water displacement density test) are used to test the gold apart from “fool’s gold” variants.




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