noun
black sealing ink; black stamp pad
Refers to the black ink used for seals (hanko) or the stamp pad itself. Common in office and official contexts.
契約書に黒肉で印を押した。
I stamped the contract with black sealing ink.
黒肉が乾いてきたので、新しいのを買わないと。
The black stamp pad is drying out, so I need to buy a new one.