Acid test
A process of distinguishing gold from base metals, with a figurative meaning / From Wikipedia, the free encyclopedia
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For other uses, see Acid test (disambiguation).
An acid test is a qualitative chemical or metallurgical assay utilizing acid. Historically, it often involved the use of a robust acid to distinguish gold from base metals. Figuratively, the term represents any definitive test for attributes, such as gauging a person's character or evaluating a product's performance.