Correct

白纸黑字

/ bái zhǐ hēi zì /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/白纸黑字-Chinese-idioms-Cchatty-94896f4f-2e25-4911-9705-f35d8454adb6-1612777790.jpg

Collocation

1
白纸黑字地写下来
2
白纸黑字的证据
3
白纸黑字的历史
4
是白纸黑字了

Definition

白纸黑字

Literally means:

white paper, black words

Actually means:

Nothing is easier to see than black words written on a piece of white paper. This phrase refers to some document or evidence that is as plain as daylight, or some truth that no one can deny. It emphasizes the authenticity of something.

白纸上写下的黑字,一清二楚。指明白无误的书面材料或证据,或不能否认的事实。强调事情的真实。

Example

Used as adverbial adjunct, attributive or object. (作状语、定语、宾语)
1
Zhè
zhāng
jiètiáo
借条
  
,
shì
自己
báizhǐhēi
白纸黑字
xiě
chūlái
出来
de
  
,
zěnme
怎么
可以
làizhàng
赖帐
ne
  
?

This debit note, you wrote it in black and white, how can you rely on the account?

2
zhēng
yǎnjing
眼睛
死死
dīng
zhāo
xiē
那些
báizhǐhēi
白纸黑字
de
zhěnduànshū
诊断书
  
,
huà
一句话
shuō
chūlái
出来
  

She stared dead with her eyes wide open at the white-and-black diagnosis and couldn't say a word.

3
de
zhèng
证词
jīng
已经
shì
báizhǐhēi
白纸黑字
le
  
,
guǒ
如果
shì
jiǎ
de
  
,
jiùyào
就要
chéngdān
承担
zuōwěi
作伪
zhèng
de
法律
rèn
责任
le
  

Your testimony is already in black and white, and if it's false, you'll be held legally responsible for perjury.