Osmium Tetroxide

**Definition:** (T-4)-Osmium oxide (OsO4). A highly toxic and volatile oxide of osmium used in industry as an oxidizing agent. It is also used as a histological fixative and stain and as a synovectomy agent in arthritic joints. Its vapor can cause eye, skin, and lung damage.

**Tree numbers:** - D01.640.500 - D01.650.550.600

**Synonyms:** - Osmic Acid