When the religion according to which the funeral is held is not known, it is recommended to use a white plain envelope bearing the address "Goreizen" on its front side and decorated with white and black or silver mizuhiki tied in a square knot.
どの宗教によるものか不明な場合は、白無地の包みに、「御霊前」と表書きし、白黒あるいは双銀の結び切り水引をかけるのが無難である。