Natural Gum Arabic, Grade 3, Clean Moisture content 15.0 % Total ash 4 % Acid insoluble ash 0.5 % Acid insoluble matter â?¤ 0.5 % pH 4.1 4.8 Starch or dextrin Absent Tannin-bearing gums Absent Arsenic < 3 mg/kg Lead < 2 mg/kg Cadmium < 1 mg/kg Mercury < 1 mg/kg Heavy metals < 20 mg/kg