... , pharmaceutical,metallurgy,agriculture and many other fields The Iodine(I2) is greyish black or bluish black crystal flakes or ... lump with a metallic luster, the nature is heavy, crispy and with special odor. It can ... catalyst in chemical and metallurgical industry. Agriculturally, iodine is the material for pesticide, 4-iodinephenoxy acetic, for example. Iodine is the material to ...