Ammonium sulfide solution is widely used in analytical chemistry for qualitative inorganic analysis, particularly in the identification of metal ions. It is employed to precipitate various metal sulfides from solutions, aiding in the separation and detection of specific metals. In the textile industry, it serves as a reducing agent in dyeing processes, helping to fix dyes onto fabrics. In the leather industry, it is used for depilation and surface conditioning of hides. Additionally, it is used in the production of photographic chemicals, where it acts as a sensitizer in certain photographic emulsions. In the field of electronics, ammonium sulfide solution is utilized in the preparation of semiconductor materials, where it helps in the surface treatment and etching of silicon wafers. It also finds application in water treatment for precipitating heavy metals and in the synthesis of organic compounds, particularly in the preparation of thiols and other sulfur-containing molecules. However, due to its toxic and corrosive nature, handling requires strict safety precautions.