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Folk use of elemental mercury: a potential hazard for children?

Human beings have used elemental mercury (also known as metallic mercury) for thousands of years. Early ignorance of its potential toxicity resulted in devastating adverse effects, including neurodevelopmental and behavioral deficits among exposed persons. These adverse effects most commonly resulted from exposure to the vapor of elemental mercury. Recognition of the toxicity of elemental mercury has led to strict regulation of its use in occupational settings.