Pilot Iroshizuku Bottled Fountain Pen Shin-Kai (Deep Sea)
Shin-Kai is a blue-black ink that has a strong gray tint to it. It is a rather interesting and unique color from most other ones in this range and it seems to have better shading than most other blue-black inks. The name evokes images of the bottom of the ocean; a bit dark (black) and a bit peaceful (blue) with some shades of gray.