Can you tell me the origin of the term "acid test...

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Question: Can you tell me the origin of the term “acid test”? Does it have anything to do with fool’s gold?

Answer: The phrase “acid test” is connected indirectly to fool’s gold. The term was born in the gold rush years of the mid-1800s. Since gold reacts differently to acid than do other metals, an acid test was done to determine whether the metal a miner found was in fact gold. Now the term refers to any test that produces undeniable results.