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