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Gold is one of the most durable value keepers in the world. Yet long ago, sneaky folks realized that gold could be mixed with less valuable metals to dilute its purity and create something that may have appeared similar, but wasn't the same. In some movie you've probably seen a pirate or some market vendor bite a gold coin to figure out its purity –that's because pure gold is relatively soft, and a bite could [roughly] indicate its purity.

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