Sodium Sulphidrate also known as Sodium sulfhydrate, Sodium bisulfide, Sodium Hydrosulfite , Sodium hydrogen sulfideor, or hydros is a white crystalline powder that is widely used as a reducing agent in various industrial applications. It is commonly used in textile industries for dyeing, printing, and bleaching purposes. It is also used in the production of paper and pulp, as well as in the chemical and pharmaceutical industries. Sodium Hydrosulfite is water-soluble and has a strong reducing capacity, which makes it useful for removing color and impurities from various materials. However, it is sensitive to air and moisture and should be stored in a cool, dry place.