The project involved analysing 893 Roman crucibles for non-ferrous alloys from Augusta Raurica (Switzerland) using laboratory and portable devices. This resulted in the identification of 5 clay groups, which were compared to 60 reference groups from the surrounding area. Most of the crucible clays came from 2 clay deposits, one of which was located nearby, while the other was situated 50 km away in the Jura region.
The metals casted show a large variety of bronze- and brass-alloys, due to scrap-recycling. Brass making by cementation could be proved in many crucibles.
The crucibles were composed of two layers: a wheel made core of fired ceramic and a lutum layer made of local materials applied to the exterior (and sometimes a thin engobe applied to the interior). In the casting process, the mechanically stabilising and insulating lutum swelled up and vitrified considerably.
Available open-access only.
|Author/s||Alex Furger, Markus Helfert|
|Price (CHF)||free CHF|
|Price (EUR)||free EUR|