... airtight containers. 9.Packing: 25kg/bag or drum Tannic Acid(Dyes Grade) CAS: 1401-55-4 Spc.: the national standard ... 85. Uses: As a fixing agent in textile printing and dyeing, mordant, fiber sweetening agent and synthetic dyes. Storage: Moistureproof and avoid ... strong products are:Tannic Acid(Pharmaceutical/Tech/Dyes/Food Grade),Gallic acid(3,4,5-Trihydroxybenzoic acid),Pyrogallol(1,2,3-Benzenetriol ...