Nickel 75 % min Other metallic impurities each 0.5000 max Acid insolubles 0.1000 max Particle retention on 200 b.s sieve 0.1000 max Molecular formula : NiO Molecular Weight : 74.6928 [g/mol] Molecular formula : NiO Molecular Weight : 74.6928 [g/mol] Colour: available in black & green colour.