The ferric chloride test was used to determine the presence of tannins: hydrolysable tannins produced a blue–black color;while a combi- nation of hydrolysable and condensed tannins generated a greenish color.
The ferric chloride test was used to determine the presence of tannins:hydrolysable tannins produced a blue–black color;while a combi-nation of hydrolysable and condensed tannins generated a greenish color.