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Contact SupplierIodine is a chemical element with symbol I and atomic number 53. The name is from Greek ioeidēs, meaning violet or purple, due to the color of elemental iodine vapor. Product name: Iodine crystals CAS No.: 7553-56-2 Molecular Formula: I2 Appearance: purple-black fine crystals with a metallic sheen Assay: 99.5 % Usage Mainly used in the manufacture of iodine compounds, used in the manufacture of pesticides, feed additives, dyes, iodine, paper, drugs, solvents, used in the preparation of equivalent thiosulfate solution concentration determination of iodine value, calibration, solution for disinfectants, photographic prints for iodine and thinned liquid