About: http://webisa.webdatacommons.org/216604222

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	When metal is being smelted, it usually contains oxygen and other impurities, but adding this copper to the bath can reduce the oxygen in the metal.
http://www.w3.org/ns/prov#wasQuotedFrom	wisegeek.com