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spot test

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noun
  1. an informal test run without elaborate preparation in order to obtain an immediate sample response.
  2. Chemistry. a test for the identification of an element or compound by means of a reagent that produces a characteristic color change or precipitate.
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Compare spot plate.

Origin of spot test

First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018