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During the 18th to 20th centuries, hat makers used mercury to stiffen felt for hats. Over time, the hatters inhaled mercury vapors. Many developed symptoms of chronic mercury poisoning, including psychosis, excitability, and tremors. Thus birthing the phrase mad as a hatter .

May 20, 2022•1 min read

Fun Fact: During the 18th to 20th centuries, hat makers used mercury to stiffen felt for hats. Over time, the hatters inhaled mercury vapors. Many developed symptoms of chronic mercury poisoning, including psychosis, excitability, and tremors. Thus birthing the phrase “mad as a hatter”.

Source

healthline.com

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