A while back in May 2016 there was discussion of new inks from Japan from Kyoto. I'm not even sure of the name of the company, but the box has the letters TAG on it as practically the only English. Vanness now seems to carry these inks which will make them readily available to US ink lovers. The price is $28 for a 40ml bottle, so fairly expensive, but the dollar:yen exchange hasn't been as favorable to purchasing from Japan of late so higher prices are expected.
Visvamitra did a very thorough review of this ink
and Tas did a wonderful rambling with it for us
I'm not going to duplicate what they have so excellently said. I really like this rich black ink. I like black inks. The issue I had was nib dryout leading to hard starts after only a few seconds pause. Once writing, the ink flowed great. It could be the pen has issues that other inks obscure. The nib has never been tuned, so that could be the problem especially if others didn't experience the same problem.
The ink is also a very slow drier. This won;'t be as much of a problem on more absorbent papers but on harder sized papers this will become evident.
Pen: Pelikan M400 (F 14kt)
Papers: MvL=Mohawk via Linen, TR=Tomoe River, Hij=Hammermill 28 lb inkjet, Rhodia=Rhodia 90g ivory.
Camera: iPhone 7
Not water resistant at all, but washes nicely with blue-black.
The ink also comprises a blue dye and a small quantity of brownish dye that you can see at the edge of the ink droplet.