About: http://webisa.webdatacommons.org/61938832

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 plant ash was a key component because it reduced the melting point of the silica considerably, from 1,700 degrees Centigrade to 1,000 degrees, within reach of the furnaces of that period.
http://www.w3.org/ns/prov#wasQuotedFrom	harvard.edu