Oxblood. A little morbid? Maybe. An awesome ink from Diamine? Absolutely!
Diamine Oxblood is the second ink bottle I ever picked up and it remains my favorite to this day. As I've previously mentioned, reds and browns are definitely my thing, so this is a very satisfying ink.
The writing samples were predominantly from my Pilot Falcon Soft EF nib, including the back of the nib, though I did use a Pilot Plumix (nib, transplanted into a Metro) for a little bit of an italic reference point. Oxblood flowed freely across the board, displaying a wonderful temperament. There was no feathering or bleed-through on either paper, from either pen. Diamine performs well for me through all of their inks, but Oxblood is a standout - it writes smoothly in every pen I try. The ink is saturated and rich, though it still manages to produce several different shades. Because it's a dark ink, I find it difficult to notice the shading in finer nibs; using the back of the Falcon nib or in an italic, the red really shines through. Layering or pooling the ink produces more of a brown, in my experience.
Oxblood doesn't dry particularly quickly and it's not waterproof, so there are definitely situations where this wonderful ink isn't appropriate. I don't use it in for back-pocket-notes anymore, nor at the coffee shop. I love the idea of signing with it, but signatures are one thing I definitely want to be waterproof.
On the other hand, because Oxblood is not a permanent ink, it's much safer to load into your more precious pens. It's still very saturated, so I probably wouldn't toss it into a Parker Vacumatic. But anything shy of that and I'd fill'er up!
Diamine Oxblood is a spectacular ink that's great for casual use. It's dark enough for the workplace, though it might give your coworkers the wrong impression. It might not be perfect for every situation, but I've got it loaded in at least one pen year-round.
Unless you just hate the color red, I cannot recommend this ink enough. I love Diamine Oxblood!
Testing out water resistance. Simple water drop test, only left on the paper for a short amount of time. Diamine Oxblood clearly has a waterweakness.