One data point i can contribute is calligraphic inks. Using normal fountain pen ink with a square nib dip pen will produce writing that will spread even when dry. The binding agent in the ink is designed for much smaller strokes.
Calligraphic ink (i use Windsor Newton) is quite different and forms something like a scale on the paper when dry holding everything in place. You can feel the texture of the writing when it's drym
Calligraphic ink (i use Windsor Newton) is quite different and forms something like a scale on the paper when dry holding everything in place. You can feel the texture of the writing when it's drym