About: http://webisa.webdatacommons.org/35137180

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	The greater the quantity of other chemicals, metals, water, or other impurities in the chemical, the lower the grade.
http://www.w3.org/ns/prov#wasQuotedFrom	sciencebuddies.org