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Report Abuse. Iodine is a purple solid at room temperature. Some of these people are confusing iodine with iodine (or potassium iodide) solution which is a browny/orangey/yellowy colour.When this solution is added to starch...it turns black.Why the thumbs-down???it's true!!!ome of these people are confusing iodine with iodine (or potassium iodide) solution which is a browny/orangey/yellowy colour.When this solution is added to starch...it turns black. Why the thumbs-down???it's true!!!
The triiodide ion ion slips into the coil of the starch causing an intense blue-black color. Starch Test: Add Iodine-KI reagent to a solution or directly on a potato or other materials such as bread, crackers, or flour. A blue-black color results if starch is present. If starch amylose is not present, then the color will stay orange or yellow. Starch amylopectin does not give the color, nor does cellulose, nor do disaccharides such as sucrose in sugar. Iodine Test: When following the changes in some inorganic oxidation reduction reactions, iodine may be used as an indicator to follow the changes of iodide ion and iodine element. Soluble starch solution is added. Only iodine element in the presence of iodide ion will give the characteristic blue black color.