白纸黑字[bái zhǐ hēi zì]
词典put it down in black and white：白纸黑字。
词典was written down in black and white.：白纸黑字。
词典written in black ink on white paper：白纸黑字。
词典black characters [letters] on white paper
词典black and white：白纸黑字，黑白片，单色；青红皂白；书面形式；印刷。
白纸黑字[bái zhǐ hēi zì]
put it down in black and white; (All this) was written down in black and white.; written in black ink on white paper; black characters [letters] on white paper:
例：白纸黑字， 有案可查。
(The declarations, etc.) are written down and recorded.
白纸黑字， 铁证如山。
These ironclad details are irrefutable proof in black and white.