In my quest to replace the dearly departed iron gall Montblanc Midnight Blue, I bought a bottle of Ecclesiastical Stationery Supplies Registrars’ Ink. As a usual matter, I ran Midnight Blue from my daily writer, a ‘60s (resin) 149, and never had problems with clogging or staining. I’ve tested ESSRI with dip pens, I like what it can do, and I want it to be my new Midnight Blue. However, I’m a bit concerned about clogging and staining, taking into account the normal extra maintenance recommended when dealing with iron gall ink. I must confess, ESSRI’s low price and frowzy packaging do not inspire confidence. How about it -- does anybody have successes, failures, clogs, or stains to report as a result of using ESSRI in a Montblanc piston-filler?