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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!!!
Iodine is an indicator that turns blue-black in the presence of starch. The leaf that was in the light turns blue-black, which demonstrates that the leaf has been performing photosynthesis and producing starch. Try the test again with a variegated leaf (one with both green and white) that has been in the sunlight. A leaf needs chlorophyll to perform photosynthesis â based on that information, where on the variegated leaf do you think you would find starch?