Here's a great example of one of the few fountain pen friendly iron gall inks left on the market (RIP Montblanc Midnight Blue… ). It and R&K Salix are about even on like-o-meter, but I find myself preferring Registrar's Ink due to its darker final color. http://imagizer.imageshack.us/v2/xq90/537/DZc31c.jpg