... generated as a by-product during the manufacture of Titanium Dioxide, or as a by-product of the pickling ... % , ≥ 98 99 Fe,%, ≥ 19.7 20 Insoluble matter,%,≤ 0.5 0.0015 Pb,%, ≤ 0.002 0.0002 As,%, ≤ 0.0005 ... generated as a by-product during the manufacture of Titanium Dioxide, or as a by-product of the pickling ... % , ≥ 98 99 Fe,%, ≥ 19.7 20 Insoluble matter,%,≤ 0.5 0.0015 Pb,%, ≤ 0.002 0.0002 As,%, ≤ 0.0005 ...