... Benzenetriol) CAS: 87-66-1 Spc.: Chemical reagent standard, V and K8780 reagent Name: Pyrogallic Acid Chemical Name: 1,2,3-Benzenetriol. ... ~135 Residue on ignition %: ≤ 0.025 ≤ 0.02 ≤ 0.02 Chloride %: ≤ 0.002 ≤ 0.001 ≤ 0.001 Sulphate %: ≤ 0.005 ≤ 0.005 ≤ 0.005 Heavy metal ppm: ≤ 5 ... Food Grade),Gallic acid(3,4,5-Trihydroxybenzoic acid),Pyrogallol(1,2,3-Benzenetriol),Ethyl gallate, Progyl Gallate, n- ...