The soil incorporated into Najio paper is a tuff consisting of separative volcanic ash and volcanic sand, special products for Najio (Nishinomiya City) that do not adhere to the fibers unless the new paper on the screen is left untouched on 'an upright board' for a while after the process is completed.
漉き入れる泥土は、名塩（西宮）の特産の遊離性をもつ火山灰や火山砂で構成されている凝灰岩であり、漉き上げたのち一時、簀の上の生紙を「スラシ板」にもたせかけて静止しておかなければ泥土が繊維に密着しない。