<http://webisa.webdatacommons.org/430892769>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/211547225>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/430892769> .
<http://webisa.webdatacommons.org/430892769>	<http://www.w3.org/ns/prov#value>	"As a result, other methods such as the use of dilute sulphuric acid have also been developed." .
<http://webisa.webdatacommons.org/prov/214968305>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/430892769> .
<http://webisa.webdatacommons.org/430892769>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<freepatentsonline.com> .