lodine turns starch green yellow in colour.
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Using iodine to test for the presence of starch is a common experiment. A solution of iodine (I2) and potassium iodide (KI) in water has a light orange-brown color. If it is added to a sample that contains starch, such as the bread pictured above, the color changes to a deep blue.
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The starch is the reserve food material stored in plants mainly present in the leaves. When the starch comes in contact with iodine it will show blue-black color.
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