Specification Product Name NITRO BLUE TETRAZOLIUM CHLORIDE Synonyms NBT (Nitroblue tetrazolium chloride); Nitro BT CAS NO. 298-83-9 Molecular Formula C40H30O6N10Cl2 Molecular Weight 817.65 Appearance Yellow Crystalline Powder Structure     Tests    Limits Assay (by HPLC) - 90.00% min. Solubility (10 mg/ml water) - Clear yellow solution Water by KF - Less than 4.5 % Residue on Ignition - 0.3% max. Melting Point - 184 Deg. C         REVISED: 1-1-2012