litmus test

Noun
  1. A coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions;
    Used as a very rough acid-base indicator (synset 114965545)
    is a type of: acid-base indicator - an indicator that changes color on going from acidic to basic solutions
    substance meronym: litmus paper - unsized paper treated with litmus for use as an acid-base indicator
    same as: litmus
  2. A test that relies on a single indicator (synset 107213097)
    "her litmus test for good breeding is whether you split infinitives"
    is a type of: exam, examination, test - a set of questions or exercises evaluating skill or knowledge

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