Thomas Wollstein , Jun 23, 1999; 09:04 a.m.
With my first attempt, I made a very similar experience. You can solve the problem by mixing two dyes, a neutral black one (the one that you've got) and a dark brown one. To find out the right mixture, use a scrap print on your paper. I found that two parts of the neutral black dye plus one part of the brown dye were exactly what I needed.