"* McCaffery's inks are highly acidic and can eat away at nibs. When using this ink, clean your nib thoroughly and often to avoid corrosion. You may also find mold on the surface of the ink, or a dried skin. These developments are natural and do not mean your ink has gone bad. Simply remove the mold or skin, throw it away, and stir the ink well. You are now ready to keep writing!*"

Uh, yeah.

Glass dip pens are generally available, though I haven't used one. I also have a glass-nibbed fountain pen, but it's mostly for pondering the weirdness of the universe.:-)