About: http://webisa.webdatacommons.org/232883306

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	What you are seeing is just a bit of polymerisation, this occurs normally with thin layers of oil exposed to the air for a long time (on the bottle) and especially to a combination of air and heat (on the burner).
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com