Test for Starch

Preparation of Dilute Iodine Solution
Take a test tube or a cup and add few drops of Iodine solution to it. Then dilute it with water till it becomes light yellow/brown in color.

Dilute Iodine Solution

Take a sample of food item in another test tube. Add a few drops of dilute Iodine solution on the sample you have collected.

Observe the change in color. What do you find?

If the substance turns dark-blue or black it contains starch.