Phrase of the day……when something passes the acid test (no Kool-aid involved!)


passing the acid-testPassing the acid test means “a sure test, giving an incontestable result.” In the California Gold Rush in the second half of the 19th century, prospectors and dealers needed to be able to distinguish gold from base metal. The original acid test relied on nitric acid’s ability to dissolve other metals more readily than gold. To confirm that a find was gold it was given ‘the acid test’. A test sample was used to mark a touchstone and the degree to which it dissolved when the acid was added determined whether it was gold. Various other later tests also used acid and these are all called ‘acid tests’.
Info comes from our inimitable friends at: www.phrases.org.uk/meanings/acid-test.html

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