As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of potato. The yellow-orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato. Why did the iodine solution change color on the potato? A. The iodine evaporated into a gas. B. The iodine burned the potato and turned it to ash. C. The iodine reacted with the potato to form a new substance. D. The iodine mixed with the colors of the potato so it looked black.
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Starch is the most common carbohydrate in the human diet and is contained in many staple foods. Iodine solution is used to test the presence of starch in food materials. When iodine solution is added to a food item, it turns into blue-black colour if starch is present. If starch is not present, then the color will stay orange or yellow.
So, the answer is 'Bluish black colour'.
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