Iodine is used in photographic film.
Standard State: solid at 298 K
Color: violet-dark gray, lustrous
Courteis discovered Iodine in 1811, and occurs sparingly in the form of iodides
in sea water from which it is assimilated by seaweeds. Iodine exhibits some metallic like properties and dissolves readily in chloroform,
carbon tetrachloride, or carbon disulfide to form beautiful purple solutions. Iodine
is found in nature. The iodide, and thyrozin which contains iodine, are used
internally in medicine, and a solution of Kl and iodine in alcohol is used for external
wounds. When handling pure iodine care should be taken because if contact with the
skin can cause lesions and irritate the eyes.