Tannic acid, not as free acid, is combined with caffein as a tannate.
(d) Soluble iron salts are added to give an appearance of strength by the formation of tannate of iron.
A coffee-spoonful of this solution contains 0.03 gram of the tannate, and this quantity may be given to a child, in a little milk.
Another method of mordanting cotton is to fix the metallic salt on the fibre as a tannate instead of an oleate.
This turbidity, if I remember the cyclopædia aright, is tannate of fibrin, or leather.
The tannate is decomposed in the usual way with litharge and extracted by alcohol.
tannate tan·nate (tān'āt')
A salt or an ester of tannic acid.