About: http://webisa.webdatacommons.org/109992321

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	These stains generally have a brown color and are formed by pyrolysis of particles of food, oil or other materials which penetrate into the more-or-less porous outer layers of the coating.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es