Selenium Trioxide is a chemical compound with the formula SeO3. It appears as a colorless, oily liquid and is known for its strong oxidizing properties. This compound is primarily used in the production of selenium compounds and as a reagent in various chemical reactions. In addition to its industrial applications, Selenium Trioxide can be hazardous. It can cause severe irritation to the skin, eyes, and respiratory system. Proper safety measures, including protective equipment, are essential when handling this compound to prevent harmful exposure.