Forgive me if this has been covered before and steer me to the threads if so. I now have a few vintage Parker 51s, both Aerometrics and Vac Fillers ... Are there any modern inks that can be recommended as favorable to use in these vintage stars? Are there any that should be avoided? I like to err on the side of caution for instance, and use only MB inks (which I find superior to a great many for lots of reasons) in my Meisterstuck for instance. I would not expect to have problems using most Noodler's inks in my Ahabs and Konrads, for instance. But what about vintage Parkers? I have recently used some Sheaffer Black Scrip in a Parker 51 Special with good results and no issues. Ideas? Thanks ....