>>283292746
If you get bleed-through even with black construction paper behind it, no amount of filters will help you.
Normally you'd level the fuck out of it and hope it looks ok. If it doesn't, you'd have to manually touch up until you stop caring and accept that you did more than enough.
I never had to deal with it personally, but if I really cared about it, I'd try to invert the backside of the page, mirror it, and try to reverse the bleed-through with the actual drawings from the other side. Pretty sure the result would still be subpar, but it's worth a try.
Do you have any examples for me to try?