To know the presence of phenolic compounds in A. marmelos
leaf extracts; the ferric ion reducing test was done with the
addition of FeCl3 solution (30 mM) to the aqueous leaf extracts
before and after the addition of AgNO3 and the color change of the
extracts was identified. Hydrolysable tannins give blue-black color
and condensed tannins brownish-green while forming ferrous
compound