This is not a waterproof ink. But it is nice as a fountain pen ink.

It is a very unsaturated greyish black . Very disappointed . The Parker black we get in India for 100 rupees writes similar. I wasted 1700 for this!

Wow this is popular for a reason. I bought a Platinum fountain pen which came with a black cartridge. Its not even close to this Platinum Carbon Black color. This is so much darker. Its not flat or glossy, it is in between. Looks really good on Italic or stub nibs from my Pilot pens. You need to have one black ink and this was the one I chose and I am happy to have it. I dont like black inks usually prefer dark browns, greens and blues.

染料インクらしいですが噂の通り滲みが少なく使い勝手が良いです

濃すぎず薄すぎずといったところもう少し濃くても良かったのですが文句なしです。

I like the design of the bottle, good size, exactly what I wanted, writes incredibly smoothly.