Selenic acid is a chemical compound with the formula H2SeO4. It is a strong acid and an oxidizing agent, containing selenium in its highest oxidation state. Selenic acid is typically produced by the oxidation of selenium dioxide and is used in various industrial applications, including the synthesis of selenium compounds. In its concentrated form, selenic acid is a colorless, viscous liquid. It can react with organic materials and metals, making it important in chemical manufacturing. Safety precautions are necessary when handling selenic acid due to its corrosive nature and potential health hazards.