Starch testing is a method used to detect the presence of starch in various substances. The most common test involves using iodine solution, which turns blue-black when it comes into contact with starch. This reaction helps identify starch in food items, plants, or other materials. In laboratories, starch testing is often performed to analyze the composition of samples. It is a simple and effective way to confirm the presence of starch, which is a carbohydrate found in many foods like potatoes and grains. This test is essential in both educational settings and food quality assessments.