Ormolu: The mercury is driven off in a kiln leaving behind a gold-colored veneer. The French refer to this technique as bronze doré; in English, it is known as "gilt bronze".

The manufacture of true ormolu employs a process known as mercury-gilding or fire-gilding, in which a solution of nitrate of mercury is applied to a piece of copper, brass, or bronze, followed by the application of an amalgam of gold and mercury. The item was then exposed to extreme heat until the mercury burned off and the gold remained, adhered to the metal object.

SOURCE: http://www.wikipedia.org

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