About: http://webisa.webdatacommons.org/156017776

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	It is preferred, however, that use is made of a liquid such as xylene having approximately the same refractive index, 1.5 to 1.55, as the emulsion which will normally be mainly gelatin.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es