Starch Indicator (0.2%, 5% KI) is widely used in analytical chemistry, particularly in titration experiments, to detect the presence of iodine. Its primary application is in iodometric titrations, where it serves as a visual indicator to determine the endpoint of the reaction. When iodine is present, the solution turns a deep blue or blue-black color due to the formation of a starch-iodine complex. This color change is highly sensitive and allows for precise measurement of iodine concentration in various samples, such as in the determination of vitamin C content or the analysis of oxidizing and reducing agents. Additionally, it is employed in water quality testing to measure residual chlorine levels. Its simplicity and reliability make it a crucial tool in both educational and industrial laboratory settings.