Pyrogallol(1,2,3-Benzenetriol) CAS: 87-66-1 Spc.: Chemical ... lined cardboard round drum, Net wt 25kg. Technical data: tech grade CP grade AR grade Appearance: White powder White powder White powder Purity %: ≥99 ... are:Tannic Acid(Pharmaceutical/Tech/Dyes/Food Grade),Gallic acid(3,4,5-Trihydroxybenzoic acid),Pyrogallol(1,2,3-Benzenetriol),Ethyl gallate ...