also: くれないいろ
noun
Refers to a vivid, deep red color, often associated with traditional Japanese aesthetics. The reading べにいろ is most common; こうしょく is a less frequent on'yomi reading, and くれないいろ is a rare literary reading.
彼女は紅色の着物を着ていた。
She was wearing a crimson kimono.
夕焼けが空
The sunset dyed the sky crimson.
Compound of 紅 (べに, 'crimson, rouge') and 色 (いろ, 'color'). The reading こうしょく is the on'yomi, and くれないいろ uses the older native Japanese word for crimson.