About: http://webisa.webdatacommons.org/363970553

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	It may not be abrasive enough to work on obsidian, but we used it all the time to remove scratches on gemstones and sometimes precious metal including platinum.
http://www.w3.org/ns/prov#wasQuotedFrom	audiokarma.org