Tachikawa Comic Nib Fountain Pen Refill has a pigmented ink dries quickly, water resistant, and lightfast.

These are available in 2 colours- Black and Sepia in pack of 2

Tip- For installing Ink cartridge, keep the nib of pen facing downward. After installing, the pen is best stored vertically, with the nib down. Ensure that the cap is properly seated and tightly attached to pen.