Red peeling - Akamuki

…These knots are then shaved with a knife to give them a shape and remove the fat that has seeped out onto the surface, making it easier for mold to grow. Once shaved, the knots have a reddish-brown surface, so they are called "naked knots" or "red-peeled knots." In some regions, they are also called "waka knots," "yaki knots," or "shin knots." …

*Some of the terminology that refers to "akamuki" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…これを小刀などで削り，形を整えるとともに表面にしみでている脂肪を除きカビの発生をよくする。削り終わった節は表面が赤褐色なので〈裸節〉または〈赤むき〉とよぶ。地方によっては若節，焼節，新節ともいわれる。…

※「赤むき」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報