Measuring the absorbance of the solution of gallic acid.
packaging solution Folin-Ciocalteau reagent in a test tube and 5 mL tubes, 5 tubes, pipette 1 mL solution of gallic acid concentration in each test tube. Folin-Ciocalteau reagent with Voltex mixture, mix well and leave it for 8 minutes, adding a solution of 7.5% Na ₂ CO ₃ 4 mL tubes were kept in the dark for 2 hours and 5 mL solution of Na ₂ CO ₃ tube 4 mL).
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