About: http://webisa.webdatacommons.org/120810415

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	In order to impart photochromism to a titanium oxide, a metal such as iron, chromium, copper, nickel, manganese, cobalt and molybdenum is generally used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com