The 5% iodine solution is an aqueous preparation of molecular iodine stabilized with potassium iodide, recognized for its characteristic brown color and strong antiseptic and oxidizing action. It is used in laboratories as an analytical reagent (starch tests and iodometric titrations) and in medicine as a topical disinfectant. It is a stable solution when stored in tightly closed amber bottles and protected from light, although it may gradually lose iodine due to volatilization over time. Due to its irritating and toxic nature, it requires careful handling with appropriate safety measures.