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Related to acid test: Acid Test Ratio
A decisive or critical test, as of worth or quality.
[From the testing of gold in nitric acid.]
a rigorous and conclusive test to establish worth or value: the play passed the critic's acid test.
[C19: from the testing of gold with nitric acid]
a severe and conclusive test, as to establish quality, genuineness, or worth.
acid test- A test that is conclusive of the value or success of something, derived from the original use of nitric acid as a test for gold.
See also related terms for success.
Any decisive test or ordeal; from the former use of nitric acid to test a metal for its gold content.