This first is comparing Microns Pens with the various Fountain pen nib sizes I have on hand.
This next page is a visual chart comparing twelve ink samples purchased through Goulet Pen Company. All these are Noodlers' brand inks. These little vials represent what the ink samples come in. And although with several papers the Noodler's #41 Brown, Lexington Grey, and Black are more or less water proof, they will still bleed to some degree on some paper surfaces. All were allowed to completely dry before taking a damp brush to the ink marks.