... Keep in airtight containers. 9.Packing: 25kg/bag or drum Tannic Acid(Dyes Grade) CAS: 1401-55-4 Spc.: the national ... Packing: plastic bag lined cardboard round drum, Net wt 25kg. Tannic Acid(Pharmaceutical Grade) CAS: 1401-55-4 Spc.: BP/AP ... brown powder, Quality index: BP 1993, AP1995 . Uses: pharmaceutical tannic acid, used for antimicrobial, treat tinea, detoxify, stop dysenterys, also used ...