na-adjective, noun
pitch black; completely black
Emphatic form of 黒い, used as a na-adjective or noun for something that is intensely or entirely black, such as soot-covered hands, dark clouds, or a blackened surface.
煙で天井が真っ黒になった。
The ceiling became pitch black from the smoke.
子どもの手は泥で真っ黒だっ
The child's hands were completely black with mud.
空に真っ黒な雲が広がっている。
Pitch-black clouds are spreading across the sky.