Mr Ebuchi Eikan is a very important artisan for Japanese cultural heritage conservation. He was certified the Selected Conservation Technology by the Agency for Cultural Affairs in 2007.
He keeps researching to find the best way and paper for individual objects. As an example, sometimes, he adds feather and even cat's droppings for the particular target, because it contains such kind of things.
That trustable paper is widely used among conservators not only in Japan also in worldwide.