Fired, blackened clay grinding bowls are stacked (center). While hot from the fire, the bowls have been blackened by rolling them in dry grass or peanut (boŋgrɛ in Nafaanra) shells. To the right, a bonfire firing is in progress. The outside perimeter of the fire is banked with previously fired but broken jars. To the left, a large clay bowl contains a bark solution into which the pots are dipped while still hot from the fire. Behind that, another bonfire burns. To the right (back, center) pots have been stacked in preparation for another bonfire firing. The fashion of blackening grinding bowls began in the Banda area sometime during the 20th century. Adadiem, 1994.