I'm a big fan of fountain pens, and lately I've been getting really excited over shading inks, so I made a pen for CSP that emulates the look! I think it looks prettiest with colored lines, but regular ol black gets a striking look too
you can download it here along with the other brushes I've made, and this one is called "shading fountain pen [sabertoothwalrus].sut"
edit: for reference I typically work on a 3000x3000px canvas at 300dpi, and use this brush at around size 17











