Heard this on the radio. I took that as a threat. Lol
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Iodine evaporates over time.
If your table salt has been sitting for 3 months or more, there is basically no iodine left.
Iodized salt has a shelf life of five years.
Iodized salt doesn't contain elemental iodine, but does contain potassium iodide. Elemental iodine will sublimate into the atmosphere.