Inkfarm's 200xl cartridges come in an 8 pack consisting of 2 sets - an "A" set and a "B" set. In order to use the cartridges, you must first use the A set. Once the A set has been exhausted, you can then use set B. You will need to follow these steps with every order switching between set A and B. If you exchange one set A with another set A, the cartridges will not work. This is the same with set B. For any questions you may have, please use our
online email form, or call us between 9:00 AM and 5:00 PM PST at 1-800-465-3276.
I generally use much more black ink than colored. Can I buy extra A and B type black cartridges for the lexmark office edge pro4000 (200xl compatible) and just add a new A type black cartridge to the half used A type colored cartridges.