About: http://webisa.webdatacommons.org/232983200

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	There have been tests with sandpaper and coarse sand that has been dragged across the glass and caused scratches but keys and coins typically do not do much unless there is a very sharp edge and a lot of pressure.
http://www.w3.org/ns/prov#wasQuotedFrom	androidcentral.com