The meticulous work when it comes to packing tuna is something you see in the video. The paper they use is a special paper that looks like simple paper yet it isn’t. The paper is absorbent unscented and it has an outer layer to prevent any kind of spoilage. The final steps are a slight vacuum by a hand vacuum to prevent oxidation. The fishmongers at tsukiji prefer to avoid any kind of browning before it arrives to the client.