*6.3.8 Tests for tannins and phenolic compounds*

To 2–3 ml of extract, add few drops of the following reagents: 5% FeCl3 solution shows deep blue-black coloration. Addition of lead acetate solution shows white precipitate. Addition of gelatin solution shows white precipitate. Addition of bromine water shows decoloration of bromine water. Addition of acetic acid solution shows red colored solution. Addition of dilute iodine solution shows transient red color. Addition of dilute HNO3 shows reddish to yellow color. Addition of dilute KMnO4 shows disappearance of Pink color.
