02:32DiscoveryIn Their ElementGold and silverBBC World Service Duration: 27 minutes Tue 19th May 2020, 02:32 on BBC World Service Americas and the CaribbeanAvailable for over a yearListen nowScience and art of gold and silver Show more GenresFactualScience & NatureFormatsMagazines & ReviewsBrandDiscoverySeriesDiscovery: In Their Element Source: BBC Online