About: http://webisa.webdatacommons.org/172659419

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	At about 0.1 ??m there is a white, but for thinner films the colour approaches black (film invisible) as the light from front and back cancel.
http://www.w3.org/ns/prov#wasQuotedFrom	du.edu