The extracted tannin, standard hydrolysable
(tannic acid, Merck) and standard condensed tannins
((+)-catechin, Sigma-Aldrich) were assayed for tanning
properties by their abilities to interact with ferric
chloride, gelatin, lead acetate and bromine water.
The amount of 0.25 g of the tannin samples were
dissolved with distilled water and the final volumes