Bida glass beads (Nupe drawn-glass industry)
Wound and drawn glass beads produced by hereditary guild families in Bida, Niger State, representing one of the few documented indigenous African glass-bead industries.
The Bida glass industry is centred on the efu guild -- hereditary glassworking families in the emirate city of Bida, Niger State -- who produce wound and drawn beads as well as small glass vessels using recycled glass remelted in clay furnaces. The industry is documented from at least the eighteenth century and survived colonial disruption, making Bida one of a handful of sub-Saharan locations with a continuous, named local bead-production tradition. Characteristic bead types appear in translucent greens, turquoise blues, and amber tones, with gentle colour striations along the bead axis and slight surface irregularity distinguishing them from the uniform surfaces of industrially made trade beads.
Within Nupe society and across the wider central-Nigerian trade network, Bida beads functioned as prestige objects, bridewealth items, and currency substitutes, as documented by S.F. Nadel in A Black Byzantium (1942). Their collectibility rests on their status as a localised, historically grounded material culture product rather than an import, and on the relative difficulty of securely dating examples -- a task that depends on comparative collection reference and physical analysis rather than stylistic criteria alone. The efu guild's hereditary transmission of furnace technique gives the production a social depth directly analogous to the Nupe woodcarving and metalworking guilds.