Explanatory notes
… Metal containing by weight at least 99.9 % of lead, provided that the content by weight of any other element … Lead is mainly extracted from galena, a natural lead sulphide ore often containing silver. The crushed ore, after … sintering process, the sulphide is largely converted into oxide; in the smelting process, the oxide is reduced to lead …Legal note
… Metal containing by weight at least 99.9 % of lead, provided that the content by weight of any other element …