Urushigami Monjo refers to the ancient documents that remained without corruption and were made by using the disposal documents as the paper lid of the container that had lacquer inside and permeating lacquer into the paper.
漆紙文書（うるしがみもんじょ）とは、廃棄文書を漆の入った容器の蓋紙にし、それに漆が浸潤したことによって、腐らずに残った古代の文書。