Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Degree of purity-en#Sense
Grado de pureza-es#Sense
Degré de pureté-fr#Sense
Puhtausaste-fi#Sense
Reinheitsgrad-de#Sense
Zuiverheidsgraad-nl#Sense
Finhed-da#Sense