About: http://webisa.webdatacommons.org/439086216

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	Usually the result of: Natural oxidation of aluminium Cutlery being allowed to scrape the surface, for example during mixing Cause & Prevention CAUSE We usually find that discolouration of metal is simply natural oxidation.
http://www.w3.org/ns/prov#wasQuotedFrom	ukwhitegoods.co.uk