Bucchero objects are characterized by a distinctive homogeneous and intense black, not only on the their surface but also within the material they are made of. The procedure is usually done durin the first baking stage by reducing the intake of oxygen, resulting in the transformation of ferric oxide into ferrous oxide.
 
To obtain black and smooth mirror glass-like surfaces, polishing is necessary before cooking, when the clay is still damp and features a leather-hard surface, thus filling pores. Further polishing is performed after baking.
 
 
The ancient use of the bucchero technique, traditionally linked to Etruscan pottery, is witnessed by the discovery of local Nuragic findings, proving the circulation of such products on the island as a result of the relations and the exchanges between the two civilizations.