My attorney says, "just not black," when asked what color ink to use for legal documents. Other attorneys insist on blue. When I bought land a couple of years ago the woman doing the papers insisted on blue.

So, I use Noodler's Legal Lapis. Bulletproof, archival, and a reasonably dark blue from a wet pen. It does have a bit of a teal, blue-jeans looking color which some don't care for, but the ink works well for me. Lots of nib creep though.

Noodler's makes a vintage-colored ink, Ellis Island I think it is called. I don't know a lot about it. I think it is a dark blue meant to replicate the color of old signatures of people coming into America for the first time at Ellis Island.