I used to work in a integrated circuit debugging lab. We had a pulse laser that we would use to ablate the layer of glass on top of the metallization so we could probe the die.

While goofing around I discovered that I could vaporize the ink of dollar bills. The largest area per pulse was pretty small, 25 microns if I remember right. Maybe 100. So it wasn't very practical, but it worked.

I don't remember if I tried it with pen ink. It might work okay for ball-point as that mostly lays ink on top of the paper. You'd still have the impression in the paper from the pen though.

Ink that didn't soak in but lay on top of the paper would probably stand a good chance of working. Maybe gel ink?