spot test

listen to the pronunciation of spot test
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Английский Язык - Английский Язык
The addition of a single drop of a reagent to a small sample as a qualitative analytical test for the presence of a specific compound or class of compounds

The DPA test referred to by Martz is a color spot test for a range of oxidizing compounds, which include but are not limited to nitrates.

fast quiz; random sample
spot test