Tannic Acid 25kg
Tannic acid is a form of tannin. It has week acidity due to the multiple phenol groups in the structure. The acid is a mixture of polygalloyl glucoses, it is extracted from tara pods and gallnuts. Tannins are often used in the process of staining wood and also in the dying process for cellulose fibres such as cotton. It is also used in the conservation of iron based metal objects to passivate and inhibit corrosion.