|Dijon—Bernard Courtois elements
It was an accident, but Bernard Courtois realized he had found something new, an element that no one else had previously described. Courtois was processing seaweed for sodium carbonate, but he added too much acid, making a cloud of purple vapor that crystallized on cold surfaces. Courtois gave samples to Ampère and Gay-Lussac, who confirmed the discovery, and Ampère gave some to Davy, who named it iodine.
Atomic number 53
Dietary supplement (essential for life) Disinfectant (antibacterial and antiviral) Staining (for starch or cancerous tissue) And protecting the thyroid from nuclear fallout (just in case)
Stuff that stings
A glass rod was attached to the lid of the little bottle of tincture of iodine. Mom would wipe its cold glass knob over a cut to apply the rusty iodine. That stuff would sting like heck. Man, that stuff would sting like heck.