About: http://webisa.webdatacommons.org/317094845

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	In instances where the coating is to be formed of material other than silica, as for instance of magnesium fluoride, preferably the material is reduced to proper shape and size by prolonged ball milling as referred to above.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com