Definition: sulfanilic acid 0.5, dissolved in dilute acetic acid 150, mixed with naphthylamine 1, and dissolved in boiling water 20; the blue sediment that forms is dissolved in dilute acetic acid 150; a few drops of this reagent added to water, saliva, or other fluid to be tested will produce a red color if nitrites are present.
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Examples: glitazone, GI cocktail, etc.