About: http://webisa.webdatacommons.org/431249105

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	However, etching processing of an aluminum surface using such as aqueous solution of acid or alkali leads to the formation of areas of a black, insoluble residue, or smut, on the surface.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com