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Currently, the earliest finds known are from ca. The author is greatly indebted to communication and help from experienced goldsmiths David Loepp (IT), Louis Hankart (NL) and Birgit Doesborg (NL).Īrtificially dark patinated copper alloys appear in various times and regions and are commonly applied in prestigious polychrome metallic objects. Common salt (NaCl) represents one possible patination ingredient to compare with the archaeological material, and corroborates earlier work by other authors.

A polymetallic eutectic was observed in the production of the alloys which raises questions with regard to other experimentally produced samples and production choices in antiquity.
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Production of 4 arsenical copper alloys and material analysis (ICP-OES, SEM ) was done in laboratories of Deutsches-Bergbau Museum in Bochum (Germany), while 4 arsenic free copper alloys were cast in a goldsmith’s workshop (Birgit Doesborg) in the Netherlands. As part of a master’s thesis project (Talma, 2015), the goal was to explore possible patination agents feasible for the Eastern Mediterranean Bronze Age, and to investigate observations put forward by Giumlia-Mair and Lehr (1998 2003). The process in which artificial patination was achieved in prehistory is unknown, however specialized knowledge exists for the production of the modern Japanese irogane alloys. Their patina consists of cuprite (Cu 2O) however sometimes it may also contain tenorite (CuO). The unusual colour variations observed in these patinas, ranging from black to blue to purple, is due to a minor amount of gold (Au) and silver (Ag) in their copper matrix, whereas accompanying elements such as tin (Sn), iron (Fe), and arsenic (As) might influence workability, hue or shine. Putting life into Late Neolithic housesĪrtificially patinated copper alloys are found archaeologically in polychrome artefacts from the 19th century BC Egypt to historical and contemporary Japan.Experimental Archaeology the Exhibition.
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