DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   blue copy /blˈuː kˈɒpɪ/
   Durchschrift mit Kohlepapier
      Synonyms: carbon copy, carbon
    see: copy, copies, carbonless copy