Used primarily in iodometric titrations to detect the presence of iodine. Forms a deep blue complex when iodine is present, making it ideal for visual endpoint detection in redox titrations involving iodine and thiosulfate. Commonly used in water analysis to determine free chlorine, in pharmaceutical testing, and in educational labs to demonstrate titration principles. Also applied in starch testing of food samples and biological materials to confirm the presence of starch by producing a blue-black color upon reaction.