on saleDe Atramentis Document Ink Black Red - 45ml Bottled Ink

Ink flow is smooth and consistent, a little steer than most. I had to go down a nib size to get it to behave best. The color is good, nice variation. Quite permanent, though, so be careful filling the pen.

For a permanent dark brown ink, DeAtramentis Black Red is your choice. It's a classy ink on its own. It's not quite black, leaving you wondering just exactly what color it is! To attain a dark brown (chocolate brown, etc.), dilute the ink with DeAtramentis dilution liquid. I'm at 85% ink, which leaves a dark brown line. I think I'll also try 80%.OTOH, if you want a medium-dark brown, your best choice is DeAtramentis Sepia Brown. (I have sampled many ~permanent ~brown inks.) Sepia Brown is brown! No guessing whether you're looking at a golden brown or a brownish gold or on and on and on. It's brown! Like other DeAtramentis document inks, the ink is perfectly waterproof. It is essential to use the dilution liquid. It is, in effect, transparent document ink. Thus, diluting the ink will affect the color, but it will not affect the water fastness of DeAtramentis document inks.