Le poignard chalcolithique de la Croix-de-Fer (Espondeilhan, Hérault)

Paul Ambert · Marc J. Leblanc · Jean-Roger Bourhis · Jean-Luc Espérou

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Metallurgy and Cultural Artifacts Archaeological and Geological Studies Cultural Heritage Materials Analysis

Abstract

ABSTRACT The chalcolithic dagger from Croix-de-Fer (Central-Languedoc, France) shows a striking golden patina which could, at first sight, be ascribed to a precious metal plating on the copper blade — a rather complex metallurgical technique. Spectrogra- phic analysis of the copper blade shows the typical composition of the copper ores and artifacts from Cabrières, which are characterized by the presence of Sb and Sn, and a relatively high silver content (4 % Ag) but only very low traces of Pb. From SEM investigations and analysis, after micro-drilling of the dagger surface, the golden patina appears to consist of native silver dots and plates which could result from silver diffusion accompanying weathering of the silver-rich copper blade. In conclusion, there is no evidence of

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