adverb, adverb taking the 'to' particle
bright red; glowing red; brightly
Describes something burning, glowing, or shining with a vivid red light; often used for fires, embers, sunsets, or flushed faces. Can also be used adverbially with と.
The charcoal fire is burning bright red.
The setting sun dyed the sky bright red.
Kana spelling; used when the kanji is not needed or for emphasis.
Alternative spelling without iteration mark; less common but still encountered.
Reduplication of 赤 (あか, 'red') with the iteration mark 々, forming an adverb emphasizing a vivid, glowing red state.