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About two hundred coloured glass beads (red, yellow, green, blue, white,black, pink, plum) were selected among the thousands of beads excavated onMapungubwe hill and at K2, archaeological sites in the Limpopo valley SouthAfrica, and have been studied with Raman scattering. The glass matrix of thebeads was classified according to its Raman signature into 3 main sub-groupsand corroded glass could also be identified. At least seven differentchromophores or pigments (lazurite, lead tin yellow type II, Ca/Pb arsenate,chromate, calcium antimonate, Fe-S "amber" and a spinel) have been identified.Many of the pigments were only manufactured after the 13th century thatconfirms the presence of modern beads in the archaeological record. This callsfor further research to find a way to reconcile the carbon dating of the hill,which currently gives the last occupation date on the hill as 1280 AD with thephysical evidence of the modern beads excavated on the hill.

Raman spectra database of the glass beads excavated on mapungubwe hill and k2, two archaeological sites in South Africa