Patine croûteuse

The patine croûteuse is incontestable material evidence of repeated, often bloody or materially intensive ritual handling. The thick, fissured, almost stony or asphalt-like crust forms through libations itératives — repeated libations and ritual spittings — onto objects across generations.

The Bamana boliw altars in Mali, certain Dogon masks, and Bakongo fetish figures carry layer upon layer of sacrificial blood, millet beer, chewed kola, pulverised shells, earth, and plant extracts. Organic and mineral substances aggregate into a crust so thick it can almost entirely conceal or abstract the original sculptural cut of the wood.

From the western classical view this might look like destruction of form. In African art theory it is the opposite: the crust is the substance — matière fétiche — of the object's magical power.