... 231-820-9purity:99%stability:Stable, but air sensitive. Incompatible with strong acids, strong oxidizing agents, water, moisture.melting point ... are "food additives Sodium metabisulfite" printed on the external packing, with the sign of "Avoid moisture and heaStorage & defence: Stored ... dry place, avoid moisture and heat. No breakage, No mixed with oxidant and toxic matter. The storage period is 6 month ...