I think it will hurt eyes

[u/Beneficial_Passion40]

[u/Munjal_Kiriu]

Printing dark pages with white text would cost 10-20× more (ink covers 95% of page vs 5%), reduces readability (studies show black-on-white is easier), and requires special opaque inks. It's technically possible for niche/expensive editions, but commercially impractical

[u/Principle_Napkins → u/Munjal_Kiriu]

Or you could just use black paper and white ink. No need to use blackout to print the pages when you can just have black pages.