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Can you tell me the origin of... | Almanac.com

Can you tell me the origin of...

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

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