1- Are you going to implement dark theme in your app?

2- Which text color you should use on white background?

so for the above both task if you are using pure Black

000000 rgb(0, 0, 0)

Stop please.

Then what?
Here is a beautiful post on different shade of black color, which we can use for the same.

https://www.javaoneworld.com/2020/08/best-black-shade-color-code.html?m=1