... in pesticide, pigment, medicine, or reagent of chromatographic analysis [Quality Index]: ItemValuePremium gradeFirst gradeSecond gradeFerrous sulfate (FeSO4.7H2O) ,%≥98 ... ;avoid contact sunshine ,water and moisture;avoid contact with strong acid,oxidants or poisonous substances. Exposure to ... 5.details 6.Package supply low price and good quality Ferrous sulphate with ferrisulphas with green vitriol