Just a short one on bad paper.
They come in two forms, both of them bleed like crazy. That’s what make them bad. But they come in many different thicknesses. Bad thin paper is just horrible; think Moleskine; because you get bleed through on multiple pages at a time.
But. Bad think paper isn’t the worst thing in the world in some ways. Because bad thick paper have the shortest dry time possible. This is because instead of letting the ink dry on top of the paper like you see in the most extreme with Tomoe River, and in lesser degrees on Rhodia and Leuchtturm1917, the ink are just absorbed by the page.
I think it is a good idea when you are learning how to write with a fountain pen; especially if you are a lefty. And if you are in a meeting where you don’t want to stand out as the weirdo with arcane writing instruments and ink all over his fingers.