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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	Japan | Posted on October 25th, 2008Some organic substances have a property called photochromism, meaning that their absorption spectrum, or color, changes when they are exposed to certain types of light.
http://www.w3.org/ns/prov#wasQuotedFrom	nanotech-now.com