spot test

noun

an informal test run without elaborate preparation in order to obtain an immediate sample response.

Chemistry. a test for the identification of an element or compound by means of a reagent that produces a characteristic color change or precipitate.

Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Spot test is always a great word to know.

So is titanic. Does it mean:

the process or result of a chemical reaction to oxygen, or the deposit that forms on the surface of a metal as it oxidizes

of or containing titanium, especially in the tetravalent state or three valence state

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