Digital BW, The Print

Hmmm. I'm trying to "learn" black and white printing on my new 
Epson c86. Presently, I have only one Eboni black ink in it and the
other three slots are Epson colored inks (the MIS colored inks failed
to print.) I'm, obviously, a newbie. What other black inks can be used
in the c86 for black and white (only) printing. Thanks so much, Madeleine