About: http://webisa.webdatacommons.org/309011710

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 organics materials may be burned off, e.g. at about 700??? C. and the layer cleaned by ultrasonic methods in soapy water.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com