Potin is a base-metal alloy used mainly in antiquity, typically made of copper with varying proportions of tin and lead, and sometimes other minor elements. Its composition varies considerably, as it was often produced from recycled or locally available metals rather than a controlled alloy. It usually has a grey to dark grey appearance and is relatively soft. Potin was used primarily by Celtic tribes for casting low-denomination coinage. Potin coins often show porosity or rough surfaces due to casting, as well as corrosion due to their high lead content.
, Nomisma (potin)
