About: http://webisa.webdatacommons.org/251136150

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	Alternatively, other photosensitive materials can be used, such as gold or copper salts.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es