(Jeff Abbott is a regular contributor at The Pen Addict. You can find more from Jeff online at Draft Evolution and Twitter.)
To be honest, I didn't know brown-black inks were a thing until one showed up in the January Ink Drop shipment. I wasn't excited about it because brown is usually associated with drab and boring. It ended up being the last one I tried in the group, and I have to say I was pleasantly surprised by the ink.
The ink in question is the De Atramentis Black Edition Black-Brown. Long name, right? Let's break it down. The maker is De Atramentis — German. This ink belongs in a special edition (Black Edition) that come in a black glass bottle to keep the light from affecting the ink. Finally, black-brown is the color.
How do you make a brown ink non-boring? You add shading properties to it. Now, there isn't a ton of shading going on here, but it's enough to add a lot of interest to the ink as you're writing. Also, the hue of the ink is a really pleasant color. It's a warm, calm brown. It's dark enough to be inconspicuous, but has just enough character to attract attention from the more detail-oriented eye.