The gallic acid hair dye is used for black-dyeing of human hair.
该没食子酸染发剂用于人发的染黑。
He caught me gazing at the thick black spiky forest matting his head. "I've been dyeing it for years" he said.
看到我注视着他头上又黑又密的直发，他说：“我染发已经有很多年了。”
White chalk ashes fall in the classroom dyeing your black hair white but washing off our gaudiness making our youth more luxuriant ly green.
白色的粉笔灰，一阵阵地飘落在教室里，它染白了您的黑发，却洗尽了我们身上的浮华，将我们青春的绿色映衬得更加繁茂。
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