... % 2)package,25kg/bag 3)Usage, additives,fertilizer,water scavenging agent iron sulfate heptahydrateMolecular Formula: FeSO4·(X) H20 (X=1 or ... , iron oxide red and indigo-blue; as mordant ,tanning agent,water scavenging agent,wood preservative,disinfectant and heliograph etc.as fertilizer, herbicide ... .0002Fineness (through 180umtest sieve) %≥ 9595-- Iron Sulphate Heptahydrate water scavenging agent