QUOTE (DerMann @ Aug 28 2008, 09:35 PM)

Vintage pens can handle any ink you decide to throw at them. I only own vintage pens, and most of the inks I use are Noodler's.
Both my open nibbed Snorkel Admiral and my Triumph nibbed Sentinel work fine with Noodler's Heart of Darkness and Legal Lapis (respectively). My "51" Special is usually loaded with Noodler's La Coeleur Royale.
"51"s are particularly good at handling even the most "potent" inks. Vintage pens (the sacked ones) don't have any metal parts (apart from the nib, but gold doesn't rust/corrode) that are exposed to the ink.
Just additional info from the vintage pen repair side of things...
Even "potent" inks that are in the pH neutral range are safer than any of the vintage acid inks. If the ink is akin to battery acid - it can and will pit even a significant proportion of vintage gold alloys (ever see a 10K gold Moore super flex nib that was badly pitted? Parker victory WW II production gold alloy? Acids did that...nothing else....just inks with a pH of 1 to 2 like those still made in central Europe to this day (as well as some water resistant inks in the UK).
If it must be conventional and for some reason "bulletproof" is too durable or too something, there is the option of Borealis Black. If you had a time machine for testing the only difference to the best black of 1950 would be the fact that Borealis Black is pH neutral and the 1950 ink was alkaline.
Hope this helps.