Ferrous sulfate appears as a greenish or yellow-brown crystalline solid. Density 15.0 lb /gal. Melts at 64°C and loses the seven waters of hydration at 90°C. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. Used for water or sewage treatment, as a fertilizer ingredient.

Ferrous sulfate can be used as a chromatographic reagent, spot analysis for the determination of platinum, selenium, nitrite and nitrate. Ferrous sulfate can also be used as reducing agent, making ferrite, purifying water, polymerization catalyst, photoengraving and so on.