Learn how pure silver is carefully recovered from old jewelry. Discover the process of melting, refining, and transforming discarded pieces into valuable silver once again.

An American silver coin dating back to the 17th century, before the United States was founded, has sold for a record-breaking $2.52 million at auction, eight years after it was discovered in an ...

Roberto Frias, 4200-465 Porto, Portugal LEPABE─Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 ...