Chemical name: ferrous sulfate or Iron(II) sulfate

IUPAC name: Iron(II) sulfate

Formula: FeSO₄

Appearance: White crystals (anhydrous), White-yellow crystals (monohydrate), Blue-green crystals (heptahydrate)

Uses:

• Industrially, ferrous sulfate is mainly used as a precursor to other iron compounds.
• It is a reducing agent, and as such is useful for the reduction of chromate in cement to less toxic Cr(III) compounds.
• Historically ferrous sulfate was used in the textile industry for centuries as a dye fixative.
• It is used historically to blacken leather and as a constituent of ink.