As an example of the latter case, it is known that Fushimi tenno shinkan hokkekyo (the Lotus Sutra written by Emperor Fushimi himself) stored in the Myoren-ji Temple (Kyoto City) was written on the other side of a letter written by his father, Emperor Gofukakusa.
後者の例として妙蓮寺(京都市)所蔵の伏見天皇宸翰法華経が父・後深草天皇宸翰の書状を紙背として用いていることで知られている。