About: http://webisa.webdatacommons.org/362073408

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	While I do agree that Opal is a photonic crystal, and that the effect is based on the internal structure, that specific effect is still based on diffraction.
http://www.w3.org/ns/prov#wasQuotedFrom	typepad.com