Ferrous Sulphide
 Ferrous Sulphide (FeS) is an inorganic iron-sulfur compound appearing as a dark gray to black crystalline powder or solid. It has low solubility in water but reacts with acids to release hydrogen sulfide gas. It is used in numerous industrial and chemical processes due to its sulfide content and reactive properties. Ferrous Sulphide serves as a key intermediate in metallurgy, chemical synthesis, wastewater treatment, pigment production, and more.