also: しゅぼく
noun
vermilion ink stick; cinnabar ink stick
Refers to a solid ink stick made from cinnabar or vermilion, used in traditional East Asian calligraphy and painting for red seals or corrections.
書道の先生は朱墨で添削を入れた。
The calligraphy teacher made corrections using a vermilion ink stick.
Compound of 朱 (vermilion, cinnabar) and 墨 (ink stick). The reading しゅずみ combines the on'yomi of 朱 with the kun'yomi of 墨, while しゅぼく uses on'yomi for both characters.