Because the pungent taste of wasabi is emitted only through exposure to oxygen, the recommended grater is one that can finely mash the cells, such as one made of shark skin.

As part of trade between China and Japan, Japanese desiccated foods were a commodity brought into China (Three types of desiccated foods were often used as an ingredient in Chinese food: shark fin, dried abalone and, dried sea cucumber).

Shark fin

Often shark such as yoshikiri-zame (blue shark), ao-zame (Shortfin mako shark), onaga-zame (Thresher shark) or Billfish are used for Hanpen.

After wrapping a scabbard with shark skin, it was lacquered in black, indigo or vermilion, and then finished using a grinding stone to make a decorative pattern, which is characteristic to samezaya (a sheath made of sharkskin).

The scabbard are lacquered using techniques including 'ishime-nuri' (powdered lacquer surface to produce a coarse finish), and 'tataki-nuri' (semigloss uneven coating) to obtain a non-slip effect, 'ro-nuri' (gleaming lacquer finish), and highly ornate 'kinpun-chirashi' (sprinkling of gold powder), 'aogai-chirashi' (sprinkling of mother-of-pearl), 'kin-makie' (gold lacquer), 'scabbard covered with scraped shark skin,' 'xx kizami' (inro-kizami, grooved line patterns), and rare techniques using 'leather' or 'scales.'

In navy, swords were more ceremonial, and the tachi-style army sword ordained in 1937 employed scabbards with a black-lacquered or scraped shark skin finish.

Goods in straw bags (abalone and shark fin: both were luxury foodstuffs for Chinese food)

The heads can be an exception, but a picture of a hare hopping across the backs of sharks that have dorsal fins cannot be drawn.

Tomiko engaged in moneymaking activities, such as collecting tolls by setting up seven barriers in Kyoto (Nanakuchi-no-Seki), investing in the rice market, and taking bribes from loan sharks, and it was her financial power that enabled the Muromachi shogunate to function.

They executed policies such as the formation of trade guilds (kabunakama), the monopoly system of the copper guild and so on, mine development, the Ezo (current Hokkaido) development plan, the expansion of foreign trade by exclusive selling of sea products (dried sea cucumber, dried abalone, and shark-fin), and the reclamation of the Inba marsh in Shimosa province.