朱|あけake[0]heiban (flat)

1. no-adjectivered; vermilion; cinnabar; scarlet

• Synonym赤あかNeutralThe default, everyday word for red; 朱 is narrower — a slightly yellowish vermilion — and can also mean cinnabar, with a classical flavour.
• Synonym赤色あかいろNeutralNames the colour red, and can also figuratively mean communism; 朱 usually refers to vermilion or cinnabar.
• Synonym緋ひWrittenThe same word as the entry above; 「紅」「朱」「緋」 are all alternative writings of it, differing only in kanji while all read あか.
• Synonym丹色にいろWrittenA written, old-fashioned word for a deep, vivid red; 朱 usually refers to vermilion or cinnabar.
• Related赤みあかみNeutralA reddish tinge or slight redness, as in 「頬の赤み」; 朱 is a vivid vermilion.

Use 「朱」 for vermilion or cinnabar, as in 「朱に染まる」「朱色」. For everyday red choose 「赤」 or 「赤色」, for a reddish tinge 「赤み」, and for a deep red in formal prose 「丹色」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 江戸えど時代じだいの貨幣かへい単位たんい。