About: http://webisa.webdatacommons.org/159337413

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	Thus, foods and other perishable items, such as photographic materials can be provided with indicators which evidence a visual change after activation and the passage of a predetermined period of time.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com