About: http://webisa.webdatacommons.org/422511894

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	I did a search and found this study of magnetic material in cigarette ash I also saw references to ash containing quartz, silica and other minerals.
http://www.w3.org/ns/prov#wasQuotedFrom	macobserver.com