Dark Sealing Method[1]
Name
Kanji	封黒法印
Rōmaji	Fūkoku Hōin
Literal English	Dark Sealing Method
Debut
Manga	Chapter #184
Anime	Naruto Episode #111
Appears in	Anime and Manga
Data
Classification	Fūinjutsu
Rank	B-rank
Class	Supplementary
Range	Short-range
Users Sakon

This seal is used in conjunction with the Four Black Fog Battle Formation. After the Sound Four seal the individual in the container, this seal is added as another layer of protection. To create the seal, Sakon writes the incantation in blood on the sealing paper and then attaches it to the container before activating it with a hand seal.

References

1. ↑ Second Databook, page 267