About: http://webisa.webdatacommons.org/54179715

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	One well known group of photochromic articles which behave in the above manner are articles such as ophthalmic lenses made from inorganic glasses containing silver halide particles.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk