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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 iodide is dissolved out of the residue by boiling water, the solution filtered and the iodide oxidised to iodine using hydrogen peroxide. The iodine colours the solution brown at this stage. Isolating the iodine from this solution can be done by solvent extraction, followed by evaporation of the solvent.