What color do you write with?

[Q]

I specifically buy pens that are "blue-black" in color.  Not navy blue, but a distinct color altogether.  It's kind of become my trademark among people who know me - if it's written in blue-black ink, it was written by me.

The only pen I've been able to find that's blue-black is a Uni-Ball Vision Elite.  I've probably bought hundreds of them.