It's a color that looks like lightly tarnished copper. To me, it reminds me of the bottoms of some of the posts that my Mom used to cook in when I was a kid. It looks classy and I don't have any compunction about using it on all sorts of papers. It doesn't feather or spread. It's not going to replace your black inks, and it's not water-resistant, so it isn't going to be the ink for everyone, but I can't suggest it highly enough for anyone who is drawn to metallic colors that shade.
And here's the water-test video review: