About: http://webisa.webdatacommons.org/218471927

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	There are difficulties with such ??E shade matching, particularly for materials such as teeth which have low chromacity and small variations in hue (the polar coordinate angle of a chromacity a, b plot).
http://www.w3.org/ns/prov#wasQuotedFrom	google.com