... a cool and dry place;avoid contact sunshine ,water and moisture;avoid contact with strong acid,oxidants or poisonous substances. Exposure to ... it for a long time .used in feed, preserves, waste water treatmentand water purity, disinfection, rubber, leather,washingpowder, livestock feed, pencils. 5 ... 6.Package supply low price and good quality Ferrous sulphate with ferrisulphas with green vitriol