In searching for inks, I found a seller, Goulet pens, that had a nib comparison and a ink swab comparison, that you could use in determining how an ink might look like. You can look at ink swabs by color (say all the blues they sell), and by brand (all the Pilot inks), and then you can compare up to five inks head-to-head. Now for me, I preferred to look at how they were written with rather than the swab, as sometimes how it comes out on the page as written is not how it looks when a Q-tip is run across the page.
