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The Gallic acid reagent is used as a simple spot-test to presumptively identify drug precursor chemicals. It is composed of a mixture of gallic acid and concentrated sulfuric acid. 0.05 g of potassium nitrite is used for every 10 mls of sulphuric acid.〔Rapid Testing Methods of Drugs of Abuse. Manual for use by national law enforcement and narcotics laboratory personnel (ST/NAR/13/REV.1), United Nations, New York, 1994. 〕 Because of its short shelf life (changing to pale violet color) it is sometimes prepared by dissolving gallic acid into ethanol and adding the sulfuric acid at the time of testing from a separate bottle. In this case 100 mL ethanol is used and one drop of sulfuric acid is used per drop of gallic acid in ethanol.〔 ==See also== *Pill testing *Liebermann–Burchard test *Dille–Koppanyi reagent *Folin's reagent *Froehde reagent *Mandelin reagent *Marquis reagent *Mecke reagent *Simon's reagent *Zwikker reagent *Liebermann reagent 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gallic acid reagent」の詳細全文を読む スポンサード リンク
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