The problem modified with the discovery of cupellation, a way that permitted silver steel for being extracted from its ores. When slag heaps present in Asia Minor and over the islands of the Aegean Sea suggest that silver was staying divided from lead as early since the 4th millennium BC,[twelve] https://wissenfakt.de/maximieren-sie-ihre-gewinne-der-ultimative-leitfaden-zum-verkauf-von-silber/