Digital BW, The Print

Perhaps a dumb question, but - can I just add a new bottle of FS black 
in my CIS to my old bottle of FS black (before Eboni) - or do I have to 
get new cartridges and clean out the hoses before I do this? Can't seem 
to get a simple answer from MIS.

Thanks,
Barbara White
barbara@...
http://www.worldartphotographs.com