About: http://webisa.webdatacommons.org/204687983

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	The envelope also contains other chemicals and heavy metals, such as microscopic amounts of platinum or tin, which vary during the manufacturing process.
http://www.w3.org/ns/prov#wasQuotedFrom	center4research.org