白紙黑字

Simplified: 白纸黑字

báizhǐhēizì ㄅㄞˊ ㄓˇ ㄏㄟ ㄗˋ

    • in black and white

      written

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
white paper, black characters
Meaning
Written proof that can't be altered or denied. Like 'in black and white'.

Sources