QUOTE(*david* @ Jun 22 2008, 04:42 PM) [snapback]647823[/snapback]
I don't know the history of the blue-black inks made by Sheaffer and Parker. "Real" blue-black ink (called iron gall ink) is a completely different thing from ordinary inks, and deteriorates badly over time, as well as being naturally corrosive, so watch out if you get that. (Montblanc still makes this kind of blue-black ink. All their other inks are what we might call "normal" inks.)
It's entirely possible that these old Parker and Sheaffer products are not "real" blue-black, but simply ordinary ink made to mimic that colour. (Modern Parker and Sheaffer blue-blacks are exactly this - ordinary ink in a sort of blackish-bluish colour.) If that's the case, then go ahead and use them - they ought to be excellent. If they have a chemical smell, that's the mold prevention compound. It was very effective, but they're not allowed to use it anymore because it causes cancer in high doses or something like that.
If the ink has a moldy smell, or looks wrong, then don't use it.
Pelikan 4001 black was always a safe ink, and again as long as it looks good and doesn't smell moldy, go ahead.
The Sheaffer Blue Black is sort of a faded greenish color...like watered down black ink. IT has a chemical smell but its very faint. Its what I have been using with my vintage pens.
The Quink...I have only ever dipped a dip pen in to test it. Its "fragrance" is strong but there is no mold. The Color is more blue than black and its very vibrant.
The Pelikan is perfect. My only complaint is that it isn't waterproof. One drop of water and it will smear and smudge