Iodine used to detect the presence of starch. Iodine solution is iodine dissolved in aqueous potassium iodide. A positive result is indicated when the

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Iodine used to detect the presence of starch. Iodine solution is iodine dissolved in aqueous potassium iodide. A positive result is indicated when the amber-coloured indicator solution turns blue-black as seen on the potato. This colour is due to the presence of starch iodide.

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