the pen doesnt necessarily need to absorb the ink, the ink just needs to dry on the surface is such a way that it adheres well enough it doesn’t rub off, or stay wet.
So really, you want a high adhesion, quick drying ink, which would basically let you write on any surface it’ll stick to.
Carl@hexbear.net 1 day ago
idk how it works but it does. I’ve been using Rite in the Rain for years but there are others too if you search it up.
EpeeGnome@lemm.ee 1 day ago
Just guessing here but I imagine the ink doesn’t contain any water, so an otherwise absorbent material that is treated with a hydrophobic coating would probably work for that.