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Iodine Complex. When the element iodine is added to an aqueous starch (q.v.) suspension, molecules of the linear amylose fraction (q.v.) of starch coil around strings of iodine molecules to form long helical structures that impart a blue color to the suspension. When amylopectin molecules (q.v.) are involved in complex formation, shorter helical structures are formed that produce a red color.