Thiocyanic acid is a chemical compound with the formula HSCN. It is also commonly known as sulfocyanic acid or rhodanese. Thiocyanic acid is an important source of the thiocyanate ion, which is widely used in chemical synthesis and industrial applications. Other synonyms for thiocyanic acid include thiocyanic acid hydrogen salt, isothiocyanic acid, and mercaptocyanic acid. The acid is highly reactive and can be unstable, requiring careful handling and storage. Thiocyanic acid derivatives are commonly used in the food, pharmaceutical, and agricultural industries due to their antimicrobial properties. Overall, thiocyanic acid and its derivatives have a wide range of practical applications in various fields.