acid test

decisive test, last and final examination; test of fate; test of acidity in a substance

Acid test may refer to:Litmus test (chemistry), a common pH testa phrase that refers to a foolproof test that will accurately determine the validity of somethingAcid2, a Cascading Style Sheets testin petrology, using acid to test rock or soil for carbonatesa method using aqua regia to determine if real gold is foundThe Electric Kool-Aid Acid Test, a novel written by Tom Wolfethe "Acid Tests" conducted by the Merry Pranksters (and chronicled by Tom Wolfe)Acid Test (Liquidity Ratio), a ratio used to determine the liquidity of a business entity.Acid Test (band), a Canadian alternative rock band best known for its collaborations with the film Highway 61"The Acid Test", a short story by Ian Rankin.
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Noun
1. a rigorous or crucial appraisal
(hypernym) appraisal, assessment

the ratio of liquid assets; cash, most term investments that can be quickly realised and accounts receivable where an allowance has been made for bad debts (not stock) to current liabilities (see working capital ratio).