Digital BW, The Print

I've bought some bulk Image Specialists K3-equivalent ink, but not
from MIS.  It was a 9 ink set, and so included both MK and PK.  What I
was wondering was whether the MK is likely to be the "Eboni" ink that
is so often mentioned here, or is this an MIS-only ink?  I am assuming
that as both MK and PK are included in the set, that it's not the
"universal" MK that MIS also sell.  So the question is:  is "Eboni" an
Image Specialists ink?

Ferdinand