Knowledge of the iron trade in ancient times rests on determining the source of the objects recovered during archaeological excavations. Unfortunately, attributing the origin is not always possible using archaeological tools alone. Trace element data of the ore and the archaeological material (reduction and reheating slags, entrapped slag inclusions from the bloom, bar iron and iron blades) from two Gallo-Roman iron-making centres, Les Martys (Montagne Noire) and Les Ferrys (Loiret), were determined using ICP-AES/MS and LA-ICP-MS. The results highlight a continuity of composition that makes it possible to establish a link between the initial ore and the semi-finished iron products.
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