About: http://webisa.webdatacommons.org/243127116

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	In actual fact, the charcoal is usually ground to a fine powder and mixed with a binding agent, and sometimes clay or other ingredients to give it a smoother texture to draw with and better adherence to the paper.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com