noun, noun which may take the genitive case particle 'no'
blue and red; azure and crimson
A literary or poetic term for the combination of blue and red, often evoking vivid contrast. Used as a noun or with の to modify another noun.
蒼紅の旗が風に揺れていた。
A blue and red banner was fluttering in the wind.
夕焼けの空は蒼紅に染まっていた。
The sunset sky was dyed in azure and crimson.
紅白 means 'red and white' and is a common, everyday term (e.g., 紅白歌合戦). 蒼紅 is much rarer and more literary.
青赤 is a more straightforward, colloquial way to say 'blue and red'. 蒼紅 uses more poetic kanji and is restricted to elevated or written contexts.
Compound of 蒼 (deep blue, azure) and 紅 (crimson, red). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning 'blue and red' in literary usage.