Ilosvay reagent

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Ilosvay reagent

Sulfanilic acid 0.5, dissolved in dilute acetic acid 150, mixed with naphthylamine 1, and dissolved in boiling water 20; the blue sediment which 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 colour if nitrites are present.