We are offering mercuric oxide red extra pure hgo m.w. 216.59 assay min. 99% appearance of the solution passes test impurities with an acidic or alkaline reaction passes test chloride(cl) 0.05% nitrate(no3) passes test yellow mercury (ii) oxide passes test substance not reducible with formic acid (residue on ignition) 0.05% loss on drying (1050c) 0.5% cas no: 21908-53-2 un no. 6.11641 tariff : 2825 90 30 r : 262728-33 s : 13-28.1-45 f :