African Lost-Wax Casting

The basic method of lost-wax casting has been widely practiced on the African continent for centuries. While it is difficult to establish how the method was developed or introduced to the region, it is clear that West African sculptors were casting brass with this method for several hundred years prior to the arrival of the first

Portuguese explorers

The Portuguese in Africa, 1415–1600

along the coast in 1484. The technique requires a great deal of skill, involving extensive

knowledge of both pottery and metalworking, and a careful attention to changing

temperatures to prevent unwanted cracking or other damage to either the clay mold or

to the metal sculpture during the casting process. Some of the earliest and most

accomplished bronzeworks found in Africa date to the tenth century and are from a site called

The process begins with beeswax, latex, or another material with a low melting point. It

must be soft enough for carving fine details, but hard enough to retain its shape. After
the wax object has been carved, increasingly coarse layers of clay are applied to the
object and allowed to dry. The first and finest clay slips capture the wax details in the
smooth mold, and the coarser clay layers provide strength. The entire assemblage is
fired, causing the original wax carving to melt away, leaving only a baked clay shell.
Liquid metal is poured into the empty mold and left to cool and harden. Later, the clay
exterior is broken open, revealing the finished metal object beneath. In direct lost-wax
casting, the object produced is always unique, as the mold is necessarily destroyed as
part of the casting process.

West African sculptors have elaborated on this basic technique in a variety of ways.

Many works were produced through multiple castings and by uniting different sections

of a large vessel or figure. In addition, many of the brasses are actually a thin sculpture

of hollow metal. In this case, the wax sculpture is formed over a clay core. The two clay

parts are attached with spikes. Made from iron, the melting point of the spikes is hotter

than either the wax or brass, holding the materials in place through the phases of

heating and cooling. If reachable, the clay core is broken up and removed from the

interior of the completed brass work.

 

 

Apley, Alice. “African Lost-Wax Casting.” In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000–. http://www.metmuseum.org/toah/hd/wax/hd_wax.htm (October 2001)

 

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