About: http://webisa.webdatacommons.org/414470525

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	It has been mixed or alloyed with other metals such as silver and bronze, for example, to increase hardness and durability.Also when cleaning do not use any bleach or chlorine as that will oxidize the metal and cause it to go black.
http://www.w3.org/ns/prov#wasQuotedFrom	goldprice.org