| ≥1 piece |
An abnormal growth of plant tissue produced by irritants released by gall insects.
Gallnuts (nutgalls) contains the highest naturally occurring level of tannin (gallotannin), from 50% to 75%. It also consist of gallic acid (2-3%), and ellagic acid (2%), and glucose, starch, and etheric fats (3%).
The tannin of Gallnuts has been used for centuries for vegetable tanning of leather, and When Gallnuts extract combined with ferrous sulfate, also used as a mordant in the preparation of writing inks.
Now, Gallnuts ' extact and chemicals are widely used in Pharmaceuticals, chemicals, Food and Feed additives, Petroleum Drillin g,Dyestuff, M etallurgy . In modern industries, as a very useful natural raw material, Gallnuts (nutgalls) is more and more important for its ecological significance.