About: http://webisa.webdatacommons.org/80973789

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	Cobalt was a major coloring agent used by Greek glassworkers about the beginning of the Christian era.
http://www.w3.org/ns/prov#wasQuotedFrom	wordtrade.com