About: http://webisa.webdatacommons.org/90159545

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	Only a deity of tea would know for sure but I can tell you that it accounts for all the important factors including the time of day which determines the angle of the daylight for the red test.
http://www.w3.org/ns/prov#wasQuotedFrom	codeproject.com