A perilous process for gold-plating in which an amalgam
of mercury and gold is applied to an object and then exposed to heat to vaporize
the mercury and leave the gold behind in a thin layer. Fire gilding also is applicable
to plating silver, copper, and copper alloys. The process of fie gilding is still
used when antique work is to be repaired or an exact replica made. Fire gilding
is hazardous because mercury vapors are emitted even at room temperature, presenting
an appreciable risk of mercury poisoning. Fire gilding is also called mercury gilding.
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