In 1997, American chemist Karen Wetterhahn, a respected researcher at Dartmouth College, was exposed to a highly toxic compound called dimethylmercury during a laboratory experiment.
A few drops of the chemical accidentally came into contact with her latex protective gloves. Unknown at the time, dimethylmercury is able to penetrate many common types of laboratory gloves and absorb through the skin.
Although she initially felt fine, symptoms began appearing months later, indicating severe mercury poisoning. By the time the exposure was fully understood, the damage to her nervous system was already advanced and irreversible.
Despite medical treatment, her condition progressively worsened, and she died approximately 10 months after the accident.
Her case led to major changes in laboratory safety protocols, especially regarding the handling of highly toxic chemicals and the importance of using appropriate protective materials.
It remains one of the most cited examples in chemical safety training, highlighting how invisible exposure risks in laboratory environments can have delayed but fatal consequences.
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