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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 Iodine test is used to test for the presence of starch. Iodine solution â iodine dissolved in an aqueous solution of potassium iodide â reacts with the starch, producing a purple-black colour. The colour can be detected visually with concentrations of iodine as low as 0.00002 M at 20 Â°C. However, the intensity of the color decreases with increasing temperature and with the presence of water-miscible organic solvents, such as ethanol.