Characteristically Hosokawa-gami is made only from mulberry paper trees (no other materials are mixed) the same as Nishinouchi-gami and was called kito (a shortened form of kizuki-karakami (karakami made only from the bark of trees)) (生唐).
細川紙も西の内紙と同様に純楮の生漉き（一切他の原料を混ぜない）が特徴で、生唐（生漉き唐紙の略）と称した。