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The Romans used mercury for a variety of purposes and gave it the name hydrargyrum, meaning liquid silver, from which the chemical symbol for mercury, Hg, is derived.Demand for mercury greatly increased in 1557 with the development of a process that used mercury to extract silver from its ore.Its principal applications are in the production of chlorine and caustic soda, and as a component of many electrical devices, including fluorescent and mercury-vapor lamps.Mercury has been found in Egyptian tombs dating to about 1500 , the Greek philosopher and scientist Aristotle described how cinnabar ore was heated to extract mercury for religious ceremonies.

Worldwide, production of mercury is limited to only a few countries with relaxed environmental laws.It wasn't until 1895 that experimental work by G. Black showed that amalgam fillings were safe, although 100 years later scientists were still debating that point.Mercury found its way into many products and industrial applications after 1900.Other sources of mercury include the dumps and tailing piles of earlier, less-efficient mining and processing operations.The process for extracting mercury from its ores has not changed much since Aristotle first described it over 2,300 years ago.

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