Once the shape of mold is completed, the patterm is stamped according to the intended design. It is very time consuming work as everything is fully depending on manual work. Traditionally there are 3 major patterns always used for cast iron kettle. In particular, the arare is very typical. The shapeness of arare is depending on how deep stumping is applied and how many times the mold is re-used. In making high-end cast iron kettle, the mold is used only once. In this case, stumping work has to be carried out for each product.
(a) Arare 霰
This is the most typical design of Nanbu. Arare is manually stamped using various sizes of rod. The more vivid the arare pattern appears, the better the quality it is. The sharpness of arare is depending on the workmanship as well as how many times the same mold is recycled. In making high-end arare, the mold is used only once and it is never recycled. On the other hand, when the same mold is recycled over and over again, the arare pattern is getting blurred. There are various sizes of arare: normal size, intermediate size, Kikko (亀甲) and big size which is called Oni-arare (鬼霰). For the big size of arare, the mold often damaged when the cast iron kettle is removed from the mold. Therefore the same mold cannot be re-used.