As the way of decoration there were three ways such as relief engraving, line drawing carving and coloring, and the coloring added to the relief engraving or line drawing carving was also concomitantly used.
装飾方法は、浮き彫り、線刻、彩色の3手法があり、浮き彫りや線刻に彩色するなどの併用手法を用いている。