About: http://webisa.webdatacommons.org/100836221

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	Chalk and charcoal are the most basic of drawing materials, and used both to make sketches and finished works.
http://www.w3.org/ns/prov#wasQuotedFrom	npg.org.uk