About: http://webisa.webdatacommons.org/135285848

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	The actual density of the material (often ink and/or toner) in each test patch can then be measured to determine the effectiveness of the printing process on marking a medium, such as for example, a sheet or reference strip.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com