Pens and inks. My foray into calligraphy leads me into both.
That inexpensive chiseled-edge felt tip no longer lays down a nice even swath and corner lining is light and scratchy at best. My speedball square nibs are a most welcome respite. I've a kit of Rotring calligraphic pens on the way and I think they'll be handy for easy practice like the felt tip in that dipless way, but with the advantage of a good metal edge.
I've quite accidentally came upon ink permanence. Oh a whim, I ran a wet finger across this felt tip Gothic practice and was completely taken by surprise! The colors are absolutely lovely... of course, if that is what one wants.
Next up for the wet finger test came the Rotring ArtPen. The ink comes in little cartridges from Rotring. This stuff just completely falls apart.