Pilot Blue Black. I think it'll become one of my commonly used inks. : r/fountainpens
Ink Review #1090: Pilot Black — Mountain of Ink
Pilot Dip Pen Inks
Amazon.com : PILOT Super Color Permanent Marker Refill Ink, Black Ink, 1 Ounce Bottle with Dropper (43500) : Inkjet Printer Ink Cartridges : Office Products