As opposed to the taihei-shi characterized by wrinkle patterns, so-called sanroku-ban paper applied patterns by putting seaweed during the arrangement of the material fibers, which is as large as one sheet of fusuma-shoji, is called rakusui-shi.
皺紋を特徴とする泰平紙に対して、海藻を漉き込んで独特の紋様をつけた、ふすま障子一枚の大きさのいわゆる三六判の紙を楽水紙という。