Authentic material (6)
I believe the answer is:
actual
I believe this is a double definition.
'authentic' is the first definition.
(thesaurus)
'material' is the second definition.
(thesaurus)
(Other definitions for actual that I've seen before include "Existing in fact, current" , "De facto" , "Real and existing (6)" , "Real and concrete, not imaginary" , "Real, authentic" .)