Acid Test (gold)
An acid test is any qualitative chemical or metallurgical assay which uses acid; most commonly, and historically, the use of a strong acid to distinguish gold from base metals. Figuratively, acid test is any definitive test for some attribute, e.g. of a person's character, or of the performance of some product.
Read more about Acid Test (gold): Chemistry, Figurative Meanings
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“The test of literature is, I suppose, whether we ourselves live more intensely for the reading of it.”
—Elizabeth Drew (1887–1965)