About: http://webisa.webdatacommons.org/375753371

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	Chemical coloring techniques depend upon time, temperature, surface preparation, humidity and other variables which influence the ultimate result.
http://www.w3.org/ns/prov#wasQuotedFrom	copper.org