Chinese Galls are a type of excrescence produced on the leaves
and petioles of the tree Rhus Semialata by an insect which pierces
them and lays an egg. When the egg hatches out into a larva,
the larva becomes surrounded by the tissue of the developing
This gall or gall nut contains the highest naturally occurring
level of Tannin, from 50% to 70%. The galls are harvested and
processed to derive the various grades of Tannic Acid, which
is used in a wide variety of applications in industries such
as Electrostatic Flocking, Inks, Brewing, Wine etc.
Tannins should be avoided by those suffering from aneamia,
as they hinder the absorption of Iron.