Here's another one of the new GvFC inks: Cobalt Blue. I'm also going to review Garnet Red, soon. I will not review Stone Grey and Carbon Black, as I have no interest in these colours.
There's something weird about GvFC CB: I could swear I've seen this colour before but I can't find anything now that's like it. It's driving me bonkers! If you know which ink comes close, please let me now.
I like this ink not only because of its colour but also because it's well behaved. It dries rather quickly, has some shading, good flow properties, and actually a tiny bit of sheen! Oh, I'm a sucker for sheen. Feathering and bleed-through is not as excellent as in Moss Green and Hazelnut Brown, but it's still pretty good.
And here's an attempt to find an ink that's close to GvFC CB. My glass dip pen really isn't easy to write with. I should get a better one.