98% Ferrous Sulphate Heptahydrate is used as a precursor to prepare other iron compounds such as a lawn conditioner and a mordant for wool dyeing. It is actively used in the manufacture of ink that includes iron gall ink. It is a reagent used in the manufacturing of iron compounds, in electroplating baths, aluminum etching, process engraving and lithography and redox polymerisation. 98% Ferrous Sulphate Heptahydrate is mainly used as a reducing agent in chemical processes, leather dyes, and writing inks.