A new multidisciplinary study of a rare surviving life-sized Etruscan bronze statue has found that the black patina was intentionally created in antiquity, not the result of natural aging or a later coating. Very little is known about Etruscan art foundry methods, so this discovery advances our understanding of how ancient large bronze statues were produced.
Discovered in 1567, the hollow-cast bronze statue is now in Florence’s National Museum of Archaeology. It is known as the Arringatore (Orator) or the portrait of Aule Metli, an Etruscan senator of the Roman Republic in the late 2nd or early 1st century. He is depicted wearing a toga, calcei senatorii shoes and his right arm raised in an oratory gesture. An Etruscan language inscription on the toga names Aule Metli as the donor of this votive sculpture.
Researchers analyzed the metal composition, stratified mineral and organic material, microfragments and the manufacturing processes of the sculpture. They utilized X-ray diffraction and polarized light microscopy to examine the samples and investigate how the bronze was cast and assembled.
Tests identified a dark copper oxide called tenorite lying above a red layer of another copper oxide, cuprite. The structure appeared across several preserved areas, not merely a single stain.
The arrangement points to heating. Copper alloys typically form the reddish layer first, while the darker mineral develops under more strongly oxidizing conditions. The authors described it as “a blackish intentional patina” and said the paired layers were unlikely to form through burial alone. […]
The study also brings new details to the figure’s construction. X-ray images indicate the bronze was assembled from eight separately cast sections. Most of its hollow walls were only a few millimeters thick, evidence of considerable skill in making such a large figure.
The study has been published in the journal Heritage and can be read here in its entirety.







