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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!!!
A change of color to a blue-black or purple color suggests that starch is present. If there is no change in color, this suggests no starch is detectable. Note the change of the iodine to black on the potato (right) but not the apple (left). You can use Betadine (a povidone-iodine mixture), Lugolâs solution (an iodine-potassium mixture), or tincture of iodine (here the iodine is dissolved in alcohol, or alcohol and water), depending what is available.