Digital BW, The Print

Hi Group,

This message will display my ignorance but I need some help. I am 
using BO for my B&W printing on my R220 and enjoying the results. I 
just got my Eboni cartridge from MIS and want to replace the partially 
used Epson black cartridge with this one. 

Do I just store the partially used one in a ziplog bag and do I have 
to first tape over the ink outlet with magic tape?

Thanks