I really like this new color from Sailor! It's a dark black-brown with some okay shading in a wet pen (mine is a Pelikan M101N Lizard), and a definitely matte, almost chalky finish. This might be my new favorite! I prefer black ink usually, so I'm always excited to find one that's a little bit special/unique. The little tint of brown in this gives it a little something extra for sure!
Fantastic alternative to black
I use black ink predominantly. I write on all kinds of paper, including copy paper. I like my black inks (Pelikan, Pilot, Sailor) because they are predictable, reliable, and well-behaved. I rarely reach for a different color, but Sailor Doyou is a fantastic alternative to black. In a wet fine/extra-fine nib, it appears almost black, but has just a touch of warmth to it. It's making writing fun without being a distraction.