The application of gold to the surface of a bronze sculpture. This can be achieved by a variety of methods. Traditionally gilding was mainly undertaken using leaf gilding or mercury gilding, in which an amalgam of gold and mercury is applied to the surface and heated, causing the mercury to evaporate and the gold to fuse to the surface. From the nineteenth century electrochemical plating or deposition began to be used, as well as gold powder paint or wax. (See Vol. 1, Ch. 7 for more information).