Step 1: The Problem
Step 2: Bleed through
Step 3: Black pens
Step 4: PaperMate Pourous Point pens
Step 5: What I use now
It would be nice if I could recommend one pen for everyone. Much depends on whether you merely want to highlight, or to add your own notations, too. I use several Bibles and mark them all. Usually I do some underlining and may write a reference to an occasional cross reference. Some Bible papers bleed through more easily than others. You will probably need to do a little experimentation. But, by all means avoid cheap ball points and pens that put quite a bit of wet ink onto the paper. Those may be fine for writing on normal stationery, but not for marking the thin papers used in printing Bibles. All in all, I prefer my extra fine point fountain pen, but those are not always easy to find. In addition, one pen maker's extra fine fountain pen point may be another's fine. There is little uniformity between brands on such things.