It is used with the vermilion ink-pad specially manufactured by the National Printing Bureau and a special ruler (Inku) designed to avoid twisting and misalignment, which also ensures that the seal is placed slightly over the edge of the Emperor's name.
捺す際は、国立印刷局特製の朱肉を用いて、曲がったりずれたりしないように、かつ御名の端に少しかかるように専用の定規（印矩）を当て捺印す。