Cire perdue (Grassfields lost-wax casting)

The cire perdue or lost-wax process is the foundational technique of Grassfields brass production. A master model is formed in beeswax over a clay or dung core, then encased in a clay investment mould; when molten brass is poured in, the wax is displaced, producing a casting that retains the surface detail of the original wax work. In the Grassfields the process was controlled by specialist smiths working under royal patronage: the Bamum palace at Foumban maintained active workshops whose output Christraud Geary documented photographically and contextually in Things of the Palace (1983). The technique accounts for the characteristic surface porosity and slight irregularity of traditional Grassfields castings, features that distinguish them from sand-cast reproductions.

Objects produced by this process include tobacco pipes — the prestige object most frequently encountered by collectors — as well as standing figures, staff finials, ceremonial vessels and architectural ornaments. Because multiple chiefdoms operated workshops employing similar wax-working conventions and shared motif vocabularies, the formal output of different communities can be difficult to separate on stylistic grounds alone. Secure attribution to a specific chiefdom requires either documented provenance tracing the object to a known workshop context or close comparison with securely provenanced pieces in museum collections with pre-1940 acquisition dates.