Bronze and Metal Preservation

The bronze description plaque of Maj. Gen. William W. Loring, at right, shows a treated and untreated surface. A thorough cleaning and application of hot and cold wax brings out the deep bronze color of the metal. The untreated surface at right is dull with a green covering of patina from several years of oxidation.
	After using a pressure washer to loosen the dirt and grime on the metal, xylene is applied with a sponge to reverse the chemical process of oxidation. Restoration workers must use protective gloves and masks. Once the xylene evaporates a tac rag is used to clean the surface and remove any left over particles.
Students from Vicksburg High School assist with the application of hot wax. The wax is a mixture which is heated, mixed, then allowed to cool into a thick paste like substance which can be applied easily with a brush. A final treatment of a cold wax forms a hard protective barrier to isolate the metal from the effects of weather, sunlight and airborne contaminants.


Stonework	Cannon and Carriages

Last update: Monday, January 22, 2001
http://www.nps.gov/vick/preserve/mnts/metal.htm
Editor: G. Zeman