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In Europe, the metallurgy of copper has been a tradition for thousands of years, which is also testified by relevant artifacts that can be found. A copper ingot of unknown origin was made available for the examinations. The surface of the ingot was characterized by a deposit of corrosion products from malachite and cuprite which could also be observed in cavities. XRF measurements resulted in Cu as the main component, up to 4 wt. % As, and 2.5 wt. % S, as well as smaller quantities of Sb, Ni, Fe, and Ag. This composition suggests the production from fahlores. A typical cast structure with copper dendritic areas and concentrations of the accompanying elements in the interdendritic areas could be observed. Delafossite crystals (Cu 3 Ni 2 SbO 6 ) were verified on the ingot's top side (melt in contact with the air). The ingot is thus composed of an As bronze with a complex microstructure consisting of solid solutions, intermetallic phases, and sulfides.

Examinations of a Bronze Ingot Made of Fahlore