Wikipedia
Sodium sulfide
Sodium sulfide is the chemical compound with the formula Na S, or more commonly its hydrate NaS·9 HO. Both are colorless water-soluble salts that give strongly alkaline solutions. When exposed to moist air, NaS and its hydrates emit hydrogen sulfide, which smells like rotten eggs. Some commercial samples are specified as NaS·xHO, where a weight percentage of NaS is specified. Commonly available grades have around 60% NaS by weight, which means that x is around 3. Such technical grades of sodium sulfide have a yellow appearance owing to the presence of polysulfides. These grades of sodium sulfide are marketed as 'sodium sulfide flakes'. Although the solid is yellow, solutions of it are colorless.