Bernard Courtois, has discovered the iodine in the year 1811 in France country Courtois tries to pull potassium chloride from sea algae after crystallization of potassium chloride, he added sulfuric acid with the remaining liquid. And this is quite surprising, however, is that the production of steam, condensation, which is purple dark crystals, these are the first crystals of iodine that has done studies on this new substance, Courtois and found it compatible with phosphorus and hydrogen, but it did not cause the compound easily with carbon or oxygen. He also discovered that, when mixed with ammonia, it becomes a solid brown color (nitrogen triiodide) explosives that little touch. The name comes from iodine Greek work ' iodies ' refers to the purple.