be (put) down in black and white; black letters on white; commit (sth) to paper (/writing); words being written on the paper in black ? 小海擠進(jìn)人堆，看見一個(gè)保丁正把兩張封條十字交叉地貼在門上，～上邊扣著兩個(gè)血紅的大印。(金敬邁《歐陽海之歌》27) Hai squeezed through the crowd.A policeman was sealing the smith’s door with two crossed strips of paper. In addition to the words written on them in black were two blood-red seals.
白紙黑字bai zhi hei zi
(written)in black and white
白紙黑字
written in black and white 所有這些都是～，有案可查的。All these have been put on record in black and white.
白紙黑字bái zhí hēi zì
比喻有充分的文字證據(jù)，不容抵賴或反悔。in black and white, black letters on white paper